Well when the PTR was released for WoW a file was included in the installation called "Battle.net.dll"
Well I disassembled it and skimmed through it a bit to see what it was all about and got the following:
3C93C460 SSZ3C93C460_depot_battle_net:
3C93C460 6465706F742E62617474+ db 'depot.battle.net',0
3C93C471 000000 Align 4
3C93C474 L3C93C474:
3C93C474 54 db 54h; 'T'
3C93C475 4D db 4Dh; 'M'
3C93C476 50 db 50h; 'P'
3C93C477 00 db 00h;
3C93C480 SSZ3C93C480_0123456789ABCDEF:
3C93C480 30313233343536373839+ db '0123456789ABCDEF',0
3C93C491 000000 Align 4
3C93C494 L3C93C494:
3C93C494 00 db 00h;
3C93C495 00 db 00h;
3C93C496 01 db 01h;
3C93C497 00 db 00h;
3C93C498 L3C93C498:
3C93C498 28000000 dd 00000028h
3C93C49C L3C93C49C:
3C93C49C 3025913C dd L3C912530
3C93C4A0 00DE923C dd L3C92DE00
3C93C4A4 L3C93C4A4:
3C93C4A4 102F913C dd L3C912F10
3C93C4A8 00DE923C dd L3C92DE00
3C93C4AC L3C93C4AC:
3C93C4AC D026913C dd L3C9126D0
3C93C4B0 0027913C dd L3C912700
3C93C4B4 L3C93C4B4:
3C93C4B4 2030913C dd L3C913020
3C93C4B8 00DE923C dd L3C92DE00
3C93C4BC 0030913C dd L3C913000
3C93C4C0 1030913C dd L3C913010
3C93C4C4 148B933C dd jmp_MSVCR80.dll!_purecall
3C93C4C8 L3C93C4C8:
3C93C4C8 53 db 53h; 'S'
3C93C4C9 74 db 74h; 't'
3C93C4CA 72 db 72h; 'r'
3C93C4CB 65 db 65h; 'e'
3C93C4CC 73 db 73h; 's'
3C93C4CD 73 db 73h; 's'
3C93E040 SWC3C93E040_Battle_net_Web_Client:
3C93E040 42006100740074006C00+ unicode 'Battle.net Web Client',0000h
3C93E06C L3C93E06C:
3C93E06C 47 db 47h; 'G'
3C93E06D 00 db 00h;
3C93E06E 45 db 45h; 'E'
3C93E06F 00 db 00h;
3C93E070 54 db 54h; 'T'
3C93E071 00 db 00h;
3C93E072 00 db 00h;
3C93E073 00 db 00h;
3C93E074 00 db 00h;
3C93E075 00 db 00h;
3C93E076 00 db 00h;
3C93E077 00 db 00h;
3C93E078 L3C93E078:
3C93E078 0000000000005940 dq 4059000000000000h
3C93E080 55 db 55h; 'U'
3C93E081 52 db 52h; 'R'
3C93E082 4C db 4Ch; 'L'
3C93E083 44 db 44h; 'D'
3C93E084 6F db 6Fh; 'o'
3C93E085 77 db 77h; 'w'
3C93E086 6E db 6Eh; 'n'
3C93E087 6C db 6Ch; 'l'
3C93E088 6F db 6Fh; 'o'
3C93E089 61 db 61h; 'a'
3C93E08A 64 db 64h; 'd'
3C93E08B 00 db 00h;
3C93E08C L3C93E08C:
3C93E08C 148B933C dd jmp_MSVCR80.dll!_purecall
3C93E090 105A923C dd L3C925A10
3C93E094 148B933C dd jmp_MSVCR80.dll!_purecall
3C93E098 148B933C dd jmp_MSVCR80.dll!_purecall
3C93E09C L3C93E09C:
3C93E09C 405A923C dd L3C925A40
3C93E0A0 005B923C dd L3C925B00
3C93E0A4 705A923C dd L3C925A70
3C93E0A8 505A923C dd L3C925A50
3C93E0AC 30 db 30h; '0'
3C93E0AD 31 db 31h; '1'
3C93E0AE 32 db 32h; '2'
3C93E0AF 33 db 33h; '3'
3C93E0B0 34 db 34h; '4'
3C93E0B1 35 db 35h; '5'
3C93E0B2 36 db 36h; '6'
3C93E0B3 37 db 37h; '7'
3C93E0B4 38 db 38h; '8'
3C93E0B5 39 db 39h; '9'
3C93E0B6 41 db 41h; 'A'
3C93E0B7 42 db 42h; 'B'
3C93E0B8 43 db 43h; 'C'
3C93E0B9 44 db 44h; 'D'
3C93E0BA 45 db 45h; 'E'
3C93E0BB 46 db 46h; 'F'
3C93E0BC 00 db 00h;
3C93E0BD 00 db 00h;
3C93E0BE 00 db 00h;
3C93E0BF 00 db 00h;
3C93E118 6272616E636865732F41+ db 'branches/Augustus',0
3C93E12A 0000 Align 4
3C93E5B0 SSZ3C93E5B0_C__Battle_net_CoreDumps__s__e__d:
3C93E5B0 433A5C426174746C652E+ db 'C:\Battle.net\CoreDumps\%s_%e_%d.dmp',0
3C93E5D5 000000 Align 4
3C93C7D4 SSZ3C93C7D4__logon_battle_net:
3C93C7D4 2E6C6F676F6E2E626174+ db '.logon.battle.net',0
3C93C7E6 0000 Align 4
3C93C7E8 L3C93C7E8:
3C93C7E8 80D9913C dd L3C91D980
3C93C7EC D07F913C dd L3C917FD0
3C93C7F0 107C913C dd L3C917C10
3C93C7F4 507C913C dd L3C917C50
3C93C7F8 A0C7913C dd L3C91C7A0
3C93C7FC E0C7913C dd L3C91C7E0
3C93C800 C0C7913C dd L3C91C7C0
3C93C804 40D9913C dd L3C91D940
3C93C808 50D9913C dd L3C91D950
3C93C80C 60D9913C dd L3C91D960
3C93C810 70D9913C dd L3C91D970
3C93C814 L3C93C814:
3C93C814 30DB913C dd L3C91DB30
3C93C818 B0DE913C dd L3C91DEB0
3C93C81C L3C93C81C:
3C93C81C 60DB913C dd L3C91DB60
3C93C820 D07F913C dd L3C917FD0
3C93C824 107C913C dd L3C917C10
3C93C828 507C913C dd L3C917C50
3C93C82C A0C7913C dd L3C91C7A0
3C93C830 E0C7913C dd L3C91C7E0
3C93C834 C0C7913C dd L3C91C7C0
3C93C838 70DA913C dd L3C91DA70
3C93C83C 50D9913C dd L3C91D950
3C93C840 60D9913C dd L3C91D960
3C93C844 60DA913C dd L3C91DA60
3C93C848 75 db 75h; 'u'
3C93C849 73 db 73h; 's'
3C93C84A 65 db 65h; 'e'
3C93C84B 72 db 72h; 'r'
3C93C84C 00 db 00h;
3C93C84D 00 db 00h;
3C93C84E 00 db 00h;
3C93C84F 00 db 00h;
3C93C850 73 db 73h; 's'
3C93C851 74 db 74h; 't'
3C93C852 72 db 72h; 'r'
3C93C853 69 db 69h; 'i'
3C93C854 6E db 6Eh; 'n'
3C93C855 67 db 67h; 'g'
3C93C856 00 db 00h;
3C93C857 00 db 00h;
3C93C858 73 db 73h; 's'
3C93C859 74 db 74h; 't'
3C93C85A 72 db 72h; 'r'
3C93C85B 75 db 75h; 'u'
3C93C85C 63 db 63h; 'c'
3C93C85D 74 db 74h; 't'
3C93C85E 00 db 00h;
3C93C85F 00 db 00h;
3C93C860 72 db 72h; 'r'
3C93C861 65 db 65h; 'e'
3C93C862 61 db 61h; 'a'
3C93C863 6C db 6Ch; 'l'
3C93C864 36 db 36h; '6'
3C93C865 34 db 34h; '4'
3C93C866 00 db 00h;
3C93C867 00 db 00h;
3C93C868 72 db 72h; 'r'
3C93C869 65 db 65h; 'e'
3C93C86A 61 db 61h; 'a'
3C93C86B 6C db 6Ch; 'l'
3C93C86C 33 db 33h; '3'
3C93C86D 32 db 32h; '2'
3C93C86E 00 db 00h;
3C93C86F 00 db 00h;
3C93C870 6F db 6Fh; 'o'
3C93C871 70 db 70h; 'p'
3C93C872 74 db 74h; 't'
3C93C873 69 db 69h; 'i'
3C93C874 6F db 6Fh; 'o'
3C93C875 6E db 6Eh; 'n'
3C93C876 61 db 61h; 'a'
3C93C877 6C db 6Ch; 'l'
3C93C878 00 db 00h;
3C93C879 00 db 00h;
3C93C87A 00 db 00h;
3C93C87B 00 db 00h;
3C93C87C 6E db 6Eh; 'n'
3C93C87D 75 db 75h; 'u'
3C93C87E 6C db 6Ch; 'l'
3C93C87F 6C db 6Ch; 'l'
3C93C880 00 db 00h;
3C93C881 00 db 00h;
3C93C882 00 db 00h;
3C93C883 00 db 00h;
3C93C884 69 db 69h; 'i'
3C93C885 6E db 6Eh; 'n'
3C93C886 74 db 74h; 't'
3C93C887 00 db 00h;
3C93C888 66 db 66h; 'f'
3C93C889 6F db 6Fh; 'o'
3C93C88A 75 db 75h; 'u'
3C93C88B 72 db 72h; 'r'
3C93C88C 63 db 63h; 'c'
3C93C88D 63 db 63h; 'c'
3C93C88E 00 db 00h;
3C93C88F 00 db 00h;
3C93C890 65 db 65h; 'e'
3C93C891 6E db 6Eh; 'n'
3C93C892 75 db 75h; 'u'
3C93C893 6D db 6Dh; 'm'
3C93C894 00 db 00h;
3C93C895 00 db 00h;
3C93C896 00 db 00h;
3C93C897 00 db 00h;
3C93C898 63 db 63h; 'c'
3C93C899 68 db 68h; 'h'
3C93C89A 6F db 6Fh; 'o'
3C93C89B 69 db 69h; 'i'
3C93C89C 63 db 63h; 'c'
3C93C89D 65 db 65h; 'e'
3C93C89E 00 db 00h;
3C93C89F 00 db 00h;
The code-name has been established as "Augustus" and maybe it's some type of Auth system? There are rumors they are linking all the Blizzard games together to share the same status and connection protocol. Maybe this is for BNET 2.0?
If anyone else has taken a look at it, maybe shine a little bit more light on this.
The current version is "1.0.0.10523" and can be located
here