"Wield new shouts and spells including Dragon Aspect – allowing you to summon the inner power of a dragon to deliver colossal blows and strengthen other shouts."

My speculation about this is that it's shout activated and when in this form you get a perk tree for it like vampire lord or werewolf trees.
How do you guys/gals think the dragon aspect form is going to work? and if you think it gets a perk tree make up some perks for it.
Perks unlocked by spending souls?
http://images.wikia.com/elderscrolls/images/d/dc/Dragonborn-trailer-11.PNG

Edit:added link

I think it would work somewhat like a modifier, multiplying the damage of your hits and increasing the damage and duration of your shouts.

Here's the problem if they add new perk trees.

You can potentially give the shaft to players who used up all 81 perks. Like me for example. Before DG came out, I got my character to level 81 since I pretty much did everything in the game and why the hell not? Even then, I only spent 72 perk points. I have 9 left over with no clue how to spend them. What if I did spend them? I got to make a new character to enjoy perks they added that I never anticipated them adding?

If they add a new perk tree, which I doubt, they have to allow players to respec at least once or raise the level cap.

If dragon aspect is a perk tree for thuum, maybe we could use dragonsouls to spend on perks?

Always wanted a perk tree for thuum. One of the perks could be Thuum: 1/5 10% less for shouts to recover cost: 5 dragon souls 2/5 20% less for shouts to recover cost: 10 dragon souls and so on. Would be cool. Or another perk: all damage based thuum do 25% more damage. Cost: 10 dragon souls or what ever.

Just an idea.

edit: maybe this was the power that the dragonborn was introduced to!!! (another idea )

dragon souls? e.g a perk could be cost:20 points

I really like the idea of spending souls to unlock perks.

you know they could just make a perk tree without the need for normal level perks, right?
if they do add a shout tree itl be like the vamp lord and ww trees, where the action of shouting itself gets you the perk, not raising skills in general
or they could use dragons souls as a currecy for the perks
might as well do something with them
so theres no worries for maxed characters

As long as there is a way so people who have spent all 81 perks to enjoy the new perks if they wanted them.

todd said in an interview prelaunch that they didnt want to add new 'normal' perk trees for that exact reason cause itd get really messy and piss off peeps whod used all their perks up
so i dont think you need to worry about that issue ever arising