Telltale announced the partnership earlier this evening on its blog:
Announced this evening in San Francisco, we're excited to reveal an all-new partnership with the incredible team at Marvel Entertainment. We'll be teaming up on the development of an upcoming Telltale game series project set to premiere in 2017!
Outside of the partnership and a target date of sometime in 2017, there aren't any other details to go on. However, you'll recall that Telltale Games has been behind a number of fantastic episodic games for popular franchises such as Tales from the Borderlands and The Walking Dead. Hopefully the developer can bring its fantastic touch to some new stories centered in the Marvel universe, but we'll have to wait a bit longer to get a peek at what Telltale and Marvel have up their sleeves.
Source: Telltale Games