I think Sony still owns the rights to make Spider-Man films just as Fox owns the rights to make Fantastic Four and X-Men films. All the deals that Marvel made before the merger are still valid unless Disney buys the rights back. Eventually the rights will revert back to Marvel and Disney.
I think that Disney will provide a huge financial backing for Marvel. It will also make it easier for Disney to launch their own titles through Marvel, rather than licensing them to other companies. However, it seems like Marvel's release schedule has become a lot more inconsistent since they became a part of Disney and the paper quality of their new issues has certainly declined in comparison to other publishers.
It gives Marvel a huge backing in terms of funds, Disney is already promoting Marvel characters and products at Disneyland and on their channels, and Disney hasn't really stuck their controlling hands into the creative teams behind the comics to bend them to any forced regulations. It's been the best thing for them period. Marvel has hit so many hard times over the years regarding money, it really has done them good.
The only thing that bothered my about the acquisition is that Book Studios had some Disney Liscenes and were making amazing all ages comics of Incredibles, Darkwing Duck, Rescue Rangers, and some others that aren't coming to mind at the moment. As a crusader for more all ages comics, this was really awesome. But when Disney acquired Marvel, they ceased the liscense with Boom. I would have expected them to start picking up where Boom left off, or even getting even deeper with Mickey adventure comics (a la Floyd Gottfredson) and other stuff. I used to be a huge Doug fan, and the cartoon is owned by Disney. I could see a Doug comic in the spirit of Archie, but better. But Disney has made no effort as far as I know with making any Disney comics yet through Marvvel. It really kills me because the potential is there.
In modern day, I would definitely say so. Disney has done such a fantastic job with producing all of the recent movies that it's expanded interest in comic books as a whole and brought more cultural attention to them, and not just for Marvel. At the very least, it was a huge financial success for Marvel.
Not the best thing, but by no means a bad thing either. Disney has been content to step back and let Marvel continue to do their thing, just with added budget to the movies from Disney. But the movies aren't the be-all end-all of the property. The comics are still around, and those don't necessarily need bigger budgets to wow us.
The Disney Afternoon cartoons did have a run with an Incredibles comic through Boom Studios for some time before Marvel was acquired by Dismey, then they discontinued the line. I imagine because they didn't need to print a comic through another company anymore. Not sure why Disney has yet to continue making these comics under the Marvel banner though. The Incredibles, Darkwing Duck, and Rescue Rangers were all really great comics that held onto that cartoon vibe. I really loved them, glad I have them in trade.