Valkyria Chronicles, made of WIN and more WIN
What you should expect going into V.C. is... wait, you can't expect anything of a game such as this because you've never played anything quite like it. The closest thing(s) that V.C. can be compared to is Final Fantasy Tactics meets third person movement, and uses an aiming system that is like Fallout 3's V.A.T.S. system but free of specific area targeting. If you can wrap your head around a turn - based, tactical third person shooter that has the presentation and polish of an anime than you may find an immersive experience that you'll not soon forget.
What the previous paragraph describes barely scratches the surface of what Valkyria Chronicles offers as far as gameplay is concerned, not to mention the deep story that has a fleshed out story for not only the main protagonists, but also for the 50+ unlockable characters as well. With the customizable squad of 20 that can be tailored to make a razor sharp fighting machine and the sheer number of unit and weapon upgrades along with the in-game achievements makes V.C. a game with almost infinite possibilities that will feel fresh long after you first pick up arms to fight for freedom.
As an aside it's also worth noting that there is planned DLC for V.C.
that will hopefully make it to our shores. Keep your fingers crossed.