Thunder Game Works' Trenches was quite the hit on the iPhone last year, combining a cartoony World War 2 setting with some solid real-time strategy combat and quite a few innovative game features. The game also spawned a few spinoffs, and was popular enough for EA to publish the sequel.
There are some new features here. There are new unit types such as Cavalry and Snipers to hire and deploy for your armies, and the single-player campaign is significantly more fleshed-out, with an actual campaign to run, complete with choices to make