Hell yeah, I mained him in Melee, and I will try to in Brawl. Im already thinking up of new ways to use him judging from E for All vids and reports.
For those fearing the loss of DJCing, perhaps it may turn out for the better! Picture Yoshi doing an uair right after a double jump. He would smack them up and then follow with the momentum of the second jump so you can land another hit or two! What if you can double jump uair right into a dair? Its a crazy idea, but one possible with double jump canceling gone. Nobody was playing Yoshi right at E for All, so we really dont know his potential yet...
Oh, and Edge Egging looks to be a lot more viable also, with that lift he gets. And getting back to the stage with an Up B holds a lot of promise (use it when you are in perfect range and you will get an Egg to protect you as Yoshi pops toward the edge).
I seriously cant wait to experiment with Yoshi's new properties once the game's out...