I doubt there are any real games that will move enough consoles to really pay attention to. In Japan there may be a spike for a few weeks with WKC, but Japan as a whole has become insignificant to the home console market. Its being outstripped by places like the U.K. Most games do not move consoles, and the only game which is ensured to do so is GT5 which probably won't be releasing until the end of Q2 at minimum.
Bundles of software may be good but they absolutely kill revenue from those games, especially in America. If for example, Killzone 2 is bundled you would expect to see a lot of games hit the used market very quickly and they would not make money on the sale of the game and lose potential full retail price purchases because people would be picking up the used copies as well instead of buying the software new, so its a double hit really.
Its not like Microsft would be powerless to respond to a price cut on the PS3 either. Unlike Sony, the parent company is doing extremely well and unlike Sony they have a profit margin they can eat into for price cuts.
Tease.
