I can't say how much I don't like this. I truely hope I'm wong, but I think it is a horrible idea for Marvel. At some point someone will start telling Marvel how to do things and then its all down hill from there.
I don't think it will make a difference. I don't think Disney will mess with Marvel too much. Disney bought Pixar a few years ago and they've been left alone to do their thing and are more successful than ever.
I think its a great idea. Disney has a huge budget for films, this could possibly be the beginning of Marvel producing better quality eye candy. I've already read blogs by artists who work for marvel, apparently disney will have nothing to do with the comic books. If they do try to tamper with them, they'll have a lot of artists to deal with.