The question on everyone's mind is: why make it a PSP exclusive?
It was ultimately a question of logistics. The opportunity came up to do a tie-in game for the movie which had a fixed release date of Christmas 2007 and it really wasn't possible to develop a game for another platform in the time available -- especially since the game has to be complete and ready to hit the shelves well in advance of the movie release.
Rebellion has been working on a lot of PSP-exclusive projects lately, most notably Star Wars Battlefront: Renegade Squadron. What's so appealing about the PSP?
The PSP has a beautifully sharp and colorful screen and an incredible amount of processing power squeezed into such a small piece of mobile hardware. We have had considerable success developing for it at Rebellion and have a great deal of affection for the platform.