I decided to dissect the new .zip file.
It only contains a few new files:
WINCEIMG.BIN v6.1.7.0 -> v6.1.7.2 (The Windows CE ROM)
ezrider.exe v8.0.0.61795 -> v8.0.0.86638 (iGo v8.0)
Lang_Polish.zip (Polish language files)
SystemSetting.exe and Update.exe (no version info change), but those are compiled against the CE ROM and might be the reason why testmode does not work anymore.
I'll try to update the ezrider.exe later today via the testmode if it has any visible changes, which i don't expect due to the fact the release notes only say something about TMC.