Marvel said they were going to produce two superhero films a year. But Marvel is owned by Disney, and Disney didn't pay 4 Billion Dollars to just come out with a few Superheroes a year. They own rights to 5,000 Marvel characters. The story potential is virtually unlimited.
Even though we are getting two Marvel live action films this year, we are actually getting three films altogether - BIG HERO 6. A 3-D animated film based on a Marvel comic (see below). The Disney rendition won't be as serious a story as the comic I'm sure. But it might be a fun ride for the family. Check out the trailer below. But don't pay attention to the end premiere date, the film is coming out this Fall.
THE BIG HERO SIX COMIC, created in 1998 by Steven T. Seagle and Duncan Rouleau. These are the same guys behind Ben 10 and other successful animated properties.