There’s no hiding it this time. We have heard rumors that Power Mac G5’s had been seeded to Xbox 360 developers. That rumor was confirmed at May 2005’s Electronic Entertainment Expo, or E3, in Los Angeles this week.
The Microsoft booth contained a pair of modified G5’s that were in fact running the Xbox games that were on display.
Here’s another link that shows photos from E3 and gives some more info about the G5s.