Having played the original quite extensively, its exactly the same difficulty to bat, make outs, etc... There is a bit of a steep learning curve to get the timing down. I like the new mini games to make the spectacular catches, and the whole game just seems more fluid.
They also added in something called "Big Slam", which isn't mentioned unless you go into the strategy guide; essentially you fill up your power meter + the bit extended; then hit LB and RB. You'll get 4 pitches total, 1 pitch per hitter (if you dont whiff its a single) and the 4th batter will hit a homerun (Grand Slam) if you make contact. A new bit of strategy if you're down a lot or just want to put the game out of reach for your opponent.
My friend and I have been playing the demo non stop for the past few days, each game ending in dramatic fashion. I foresee myself picking this up on July 7th.