Warner Bros. have confirmed that Nori, one of the 13 dwarves in the upcoming The Hobbit film, will join as a playable character in the upcoming Guardians of Middle-Earth. Warner have also confirmed that Wulfrun will be a playable character as well (found in last year's Lord of the Rings: War in the North).
Guardians of Middle-Earth is planned for release later this year and the addition of Nori and Wulfrun takes the roster up to 13 with 7 left to be revealed. Among the previously confirmed characters are Legolas, Arathorn, Gandalf. Sauron and Gollum.