I'm sure we'll find out how soon, I just find it odd that some characters have been knocked down to just being alts, while others made the cut even though we were told there wouldn't be any. And there hasn't been much information on how they're different, and there's been nothing visible in the videos.
I'm pretty sure I'm just going to end up making the 'clones' as different as possible with custom sets asap.
I'm not really sure what you mean by easier to control, but really the only difference as far as this gen of smash bros goes is the smaller hitbox.
Different attacks => custom movesets / adding power to certain moves.
Faster => can't we slightly alter the speed of characters now too? or is that only in smash run or only with amiibo. I don't think this has been made to clear. (This kinda goes for Wolf too who is slower and heavier I believe)