I love a lot of the designs personally though I have to say say I really don't like Mega Blaziken's , Mega Garchomp, or Mega Lucario's much. I prefer the Kanto Mega evos over the first batch we got, but my favorites so far are Mega Absol, Mega Ampharos , Mega Lucario, Mega Blastoise, and Mega Charizard. I think they will be a great idea.
Ahhh late. But I really love the Mega Kanto starters, they're awesome, especially Mega Blastoise with it's massive cannon. Also getting the Kanto starters in the game early is awesome. With that, my Kalos starter and the Torchic distribution, you can get THREE STARTERS IN THE GAME. HOLY CRAP.
And as for Pokemon Bank, I'm loving that idea. To be able to store over 3000 Pokemon on the cloud to bring back to future generations is awesome and the small 5 dollar annual fee for all that is worth it. How about you?