T-Mobile G2 ROM ported to other Android devices, brings Google Voice to your homescreen2
What seems to be the biggest novelty is a new Google Voice widget, which can show your shoddily transcribed voicemail messages right on your homescreen, if that's your thing. Reports, however, are showing that when ported over Sense UI ROMs, the phone dialer doesn't work. This might really ruin it for you, so better off wait for the real deal come end of September.
T-Mobile G2 Preliminary Specifications