It comes down to 2 things. If Sony can meet, or possibly even beat, their 15 million projection. And if Microsoft can match their Oct-March 2008-2009 shipment numbers. At the moment Sony is 9.1 million shy of their target, but they've said that they could potentially beat that target. For the sake of argument let's say they do beat it slightly, shipping 9.6 million units by the end of March. That would mean that 360 would need to ship less than 6.7 million. In the 2008-2009 time frame it sold 7.7. Whether or not they can match that basically comes down to Kinect, although looking at the YOY comparisons for the coming weeks in 2008 looks like a relatively steep comparison even with Kinect coming out. It's possible PS3 could take the shipment lead by then but I wouldn't put good odds on it.
Proudest Platinums:
1. Gran Turismo 5
2. Persona 4 Arena
3. Wipeout HD
4. Ninja Gaiden Sigma 2
5. Super Street Fighter 4
