Paul Gitter, Marvel's president of consumer products, recently revealed that plans are in place for a stand-alone merchandising line to be unveiled next year, which will be, "presumably supported by another big budget franchise movie in 2015."
The Hulk has a unique cinematic history over the past decade. Ang Lee's 2003 Hulk didn't exactly set the world on fire at the box office, which lead to Louis Leterrier's The Incredible Hulk reboot in 2008. Even though The Incredible Hulk fared much better, both critically and financially, than Hulk, Marvel still replaced Edward Norton with Mark Ruffalo in Marvel's The Avengers.
Don't be surprised to hear more about this project in the near future, once the box office receipts for Marvel's The Avengers start to roll in.
Marvel's The Avengers was released May 4th, 2012 and stars Robert Downey Jr., Chris Evans, Mark Ruffalo, Chris Hemsworth, Scarlett Johansson, Jeremy Renner, Tom Hiddleston, Clark Gregg. The film is directed by Joss Whedon.