PC Communication is strong, but I don't think it's bad for the format.
Bicycle is really situational so it seems ok.
The only trainer card I really see as a problem is Ether cause it makes donks possible.
Cheren and Bianca FA are nice.
Hugh is awful, I wish they would at least print a good supporter, this is what BW-on needs most by far.
Cresselia-EX seems a little broken... stackable Nidoqueen as a basic? But we'll see.
I like Celebi-EX, hope there are some uses for it. =)
Landorus-EX is decent, the other EX aren't really good I think, especially cause playing the ace specs means you can't play PC Communication.
Looking forward to see the other cards... iirc there will be some starter evolutions, hope they're good. ^^
btw, Skyla + PC Communication + Sableye = imba fast setup