It won't be young versions of our heroes. I mean they will be inspired by Avengers, but it's not like they're going to be High School Adventure Avengers, with Cap worrying about if he can mow enough lawns to buy Wanda a ticket to the school dance. They're new, with others that we know coming into it, they're just younger and looking to the previous generation for inspiration.
Here's a pic of young Cap from Wizard. Looks cool, very 40's hero ish and military like.
So far, all we know is that it's a group of Young Heroes that appears a week after Avengers Disassembled ends and before the "New Avengers" appear. I'm guessing in an almost Thunderboltian kind of way, they step up to the plate to protect people when the original heroes are gone, except they don't have a hidden agenda of being villains in disguise.
Jessica Jones will be a supporting member in the books, so any Alias/Pulse fans should be happy about that.
We're probably going to just wait and find out. In Hulk's history, there are sure to be enough places where a new character could concievable be created. How many times have there been issues about mass gamma radiation or nuclear bombings in Hulk stories? What if in one, due to a genetic fluke, a boy gained Hulk like powers?
Young Iron Man could some sort of Stark robot machinery that gained sentience. Or someone in new armor.
Kid Cap might just be a costumed athlete, or a minor mutant along the lines of Ricochet or something.
For Thor...I have no idea. Unless the image spans out and we get Thorgirl, whatever happened to her? Hm. I doubt that though. Mayhap Thor had an affair with a young mortal temptress at some point, or could it be Thor himself reborn from the cycle of the gods?
Hey mister! Didjasee? Didjasee?!
http://www.popcultureshock.com/reviews.php?id=3719
Massive preview. Stuff looks great. Love Cheungs art, and Heinberg's scripting is pretty good so far.