Agreed about the pitcher confidence being overdone (at least in past years, probably this one too though).
I think the new system of mixing up the pitches is in place partly because of the perfect game challenge. I read that the winner tended to spam a particular pitch in a certain location, so this appears to be their response to that abuse. It didn't feel overdone in the demo, but then again it's only 3 innings. It felt truer to real life which is a good thing.
One thing that might cause concern down the line is the upgrading/downgrading of pitches. Seemed like any kind of hit will lower a pitch's rating but the only way to increase it is to pitch a strikeout with it. By the 7th inning your pitches could be sorta crappy if your guy's not a strikeout pitcher, even if he's having a pretty good game.