The first thing to remember is Marvel’s top movie-licensed characters are locked into long-term contracts for other studios. Disney won’t get to make a Spider-Man or X-Men movie for a while.
The second thing to remember is Marvel’s characters currently appear on several rides and attractions at the Universal theme parks; a suddenly bizarre setup that will require its own set of negotiations.
The third thing to remember is none of the articles about the transaction (at least none of the articles I could find) described Marvel as a publisher of magazines and books, only as the holder of trademark characters for exploitation in more lucrative milieux. (Update: Paul Constant’s commentary about the deal does mention the comics, and claims their current bland suckiness may be a reason why Disney wanted them.)