I didnt go to E3, but being an Insider, a lot of people in the industry were pretty disappointed with Nintendo. They felt Mario Kart Dash played rather slow, some other games were pretty huge disappointments, and above all they think stressing the connectivity between GBA-GC was not a very good choice of marketing their console.
My opinion:
I am looking forward to Mario Kart dash. I hope it's not as slow as some people say it is.
That Tales of SYmphony or something looks cool. I just hope it doesnt play like Kingdom Hearts.
As far as the GBA-GC connectivity is concerned, I dont like the GBA, nor do I want one. So I guess that limits me out from the GBA-GC games for sure. What I think would be cool is if they maybe release half of the SNES collection onto one gamecube disc. I'd much rather play that, then to harass 3 other friends to come over to my house and play Zelda with me.