I'm sure you can angle his up B at least a little bit, like you can with Kirby's. In all the games, Dedede doesn't just jump straight up and down, he has some degree of horizantal movement. Plus, a straight up and down recovery makes no sense at all, you hafta have some sideways leverage, or its literally instant death.
Also, superorange, what do you mean by that? He's just as likely to have a glide as he isnt, regardless of when he was revealed.
I noticed something. Pit and MK are shown in the E for All vids (and Charizard is said on the site) to be able to angle their glides, either swooping up or diving down. It looks like a really fluid, maneuvarable action in the clips. I don't see a huge balloon-like object being able to angle itself up or down like that.
And there's just another pic of Dedede floating in the Returning Pokemon section (look below Snorlax, things aren't looking good for him
)