Not too different from the first game. There are a few new things, and more options for multiplayer.
Now for the gameplay. It is very fun, especially online, where there is 24 player. The splitscreen mode is fun and has a lot of new options. It is new game modes, which was needed. Unfortunately, many of the older levels are gone and replaced with Episode 3 levels. The story mode is fun, because it has objectives. It is about the 501st Legion.
The graphics are good enough for me. I don't care much for the graphics, personally, so I gave it an 8. The characters look improved over the first BF. The levels look very good, especially Mustafar (the lava planet in Episode 3).
The sound is just more Star Wars music. It gets old after a while, they just use it in all of the games. This game is no exception. Unfortunately, AI players talk to you sometimes (ex. "I'm taking you down, plastic boy!"), which can be funny or annoying.
The replay value is great in this game. You can just keep playing it over and over again, especially online. The splitscreen mode never gets boring, and neither does the single player. The Galactic Conquest mode will keep you playing for a long time!
The storyline is good, but not exceptional. It could have been improved. Overall, I think that this game is great if you like shooters, Star Wars, or the first BF. If you can afford it, I would get it. You MIGHT want to rent it first if you haven't played the first game. Personally, I like the first game slightly more.