Kotaku provides quite the positive preview of the PSP version:
"I'm glad Star Wars Battlefront: Elite Squadron's space-to-ground transitions made it into the multiplayer –- there was some initial confusion about whether or not the PSP Infrastructure could handle it.
But the final answer is yes. Yes, Elite Squadron can handle all 16 players leaping from space combat to ground battles and back again almost at once. Yes, it can get hectic and confusing. And yes, you will totally love it."
IGN's preview clues us in on the story of the game beofre diving into multiplayer and Conquest mode:
"I didn't get much time with the single player campaign, but I was able to see that it spans a significant portion of the end of the Clone Wars portion of Star Wars lore. Players take on the role of X2, a highly trained clone trooper whose was used as both a teacher of other clone troopers and as a skilled warrior. Both he and his clone brother, X1 were considered the best of the best, and it was believed that the duo would hunt down, eliminate the Jedi and ensure the Empire's existence after Order 66. As a result, they were dispatched to many of the more memorable battles within Star Wars history, such as Kashyyyk, Hoth, and Dantooine. However, a confrontation was brewing between the brothers that could determine the fate of the Empire, the Rebellion and perhaps the entire galaxy."