Last week it was Bill Gates claiming that Halo 3 would be ready in Spring 2006, in time to ruin Sony's PS3 launch party; now Robbie Bach, Microsoft senior vice president and chief Xbox officer, has decided to cast some doubt over those comments. In a cover story on Time magazine last week, Bill Gates in apparent ecstatic mood was asking readers to picture a day when …Sony launches, and they walk right into Halo 3. That story, tying in well with the XBox 360 hype at E3, must have generated a...