Just got this from WZOR
MICROSOFT.WINDOWS.7.BUILD.7201.0.090601-1516.X86.ENGLISH.DVD-SUKONKA
BUILD:6.1.7201.0.winmain_win7ids.090601-1516 - IDX(RC2)branch
7201.0.090601-1516_x86fre_client_en-us_Retail_Ultimate-GRMCULFRER_EN_DVD.iso
SIZE: 2,499,923,968 bytes
MD5: 70E48837DD513BA98FE483AFD0746E37
SHA1: F2BC6FC5861C76C401DF6DA7137962C727ED938D
CRC: 102CCA5A
MICROSOFT.WINDOWS.7.BUILD.7201.0.090601-1516.X64.ENGLISH.DVD-SUKONKA
BUILD: 6.1.7201.0.winmain_win7ids.090601-1516 - IDX(RC2)branch
7201.0.090601-1516_x64fre_client_en-us_Retail_Ultimate-GRMCULXFRER_EN_DVD.iso
SIZE: 3,223,117,824 bytes
MD5: A64636ED74E50E7E882CDB5B80A8FCFA
SHA1: 92AC49897DE56F62BF0EF5C138974179EDE74C50
CRС: 0AFDFA70
NOTE: The IDX Client and Server builds are to help with final pre-deployment testing. They will be distributed to TAP and OEM customers via Connect, similar to the bi-weekly RRP audience. Timebomb behavior identical to RC. Limited servicing. Will reuse RC EULA. Same languages as RC Exit (EN,DE,ES,FR,JA).
This milestone is termed the "Internal Developer Client and Server" (IDX) build - it'san internal quality term we use meaning that the build is stable enough to deploy and evaluate, but may contain more minor bugs than a RC build.