Have just noticed folk talking about Joss doing a Cap re-write too? excellent...Joss Whedon will save the Marvel Universe, lol. Love it!
Finally, a guy who gets the characters and mechanics of superheroes will be injecting greatness into this shared universe, and we might get something more than the usual thing, which lets be honest, TIH and Iron-Man were, IM was elevated dramatically by RdJr's performance, and TIH, although very enjoyable was let down by quite crappy CGI and a absolutely fricking awful end battle.
Now, we will get the kind of developed interactions and surprises you get from great comics, instead of following the formula of all the superhero movies up until now. Thank god for that, some fresh blood and long term planning coming to the table, Marvel know *exactly* what they are doing, it needed a strong voice like this in the shared universe concept, to bring it all together in a way that feels organic and full of surprises, instead of just a bunch of action movies being linked up, the best news this concept could have had.