Good responses, and of course it's a draft (nice pun), and yes I'm very interested in how you were going to tackle the Storm flight bit.
Hahaha! You know, the pun was actually unintended.
I do think wallwalking would be good and fitting for Passage, it's offered to shifters as a paragon racial feat, or via the feet slot item.
Wow, thanks for the tip! I had started adding awkward wording about walking on walls, and checking out those showed me that I need only mention a climb speed.
I think my biggest concern with attacking/actions during the updraft is that I believe RAW would force resolution to the whole Move action before other actions could be taken, unless otherwise specified. Just like you can't make a standard action attack in the middle of walking 6 squares, you either put the standard (or minor to pick up item, Healing Word, etc.) action before the Move or after. Given that updraft is a Move action, I figured specific allowances would have to be noted otherwise other actions would have to precede or follow the entire resolved movement.
I agree with the need for specific wording to allow attacks, but when it comes to something small like grabbing an item, I think it would be allowed by a reasonable DM (it should be doable while jumping as well for instance).
I suppose for increasing fly speed I was thinking of the original (ECG) Mark of Storm "You gain a +1 bonus to speed when flying," and the Genasi Windrider feat, "You gain a +1 feat bonus to speed when you are manifesting windsoul or watersoul. When flying, you hover."
Something similar to Mark of Storm would probably apply ; Stormrider would apply as well but would be counter-productive: you cease to fly at the end of the move action, so you can't hover anymore.
As for ceilings, I wonder how the epic "2xSpeed" would play out. How often are there 60'-70' ceilings. (besides cathedrals and exteriors) Nevertheless, it's still a cool image and you can easily split it among allies. So I guess it's effective.
Epic dungeons should have cliffs and deep caverns and so on... So you'd get to fly up a cliff while your companions have to climb.
This does bring a corner case to mind: maybe I should limit the falling distance so you can't use Updraft to jump down a cliff (making the basic benefit somewhat redundant) ; I'll think on it.
My current thinking on the ceiling problem is: too bad. I suspect you won't like it, but while I try to make powers generally useful, they will always be somewhat situational. Take Finding's Unescapable Hunter: sometimes it will be worthless, sometimes great.
Updraft has enough out-of-combat utility that I don't feel too bad leaving it that way. But I may yet change my mind...