Same game as others in series; has a couple of new features and lack of real names of players.
There's also this new swing feature where you pull the analog stick back and then forward along with either pressing the left or right trigger for a power or contact swing, respectively. Or you don't have to press anything and you take a regular swing. It takes some time to get used to, and if you've played other versions of the series and you are comfortable with the setup already you can forgo this mode to swing altogether and use the old method of swinging.
Basically if you haven't played a baseball game, get this one to start. If you have a copy of mvp 05, you'll probably be happiest just playing that version. If you want to check this game out anyway though, it's only $20 bucks now so you won't break the bank buying it.