It appears Jedi Master Obi-Wan Kenobi will have a role in the new Star Wars Rebels animated show, revealed via a Hasbro toy line preview this weekend.
 
Sandtroopers.com shared picture taken at the Glendale, CA sneak preview of the Disney Store exclusive figure line reveal, which features a tiny shot of "Rebels Obi-Wan Kenobi," which more or less confirms the character will appear in the upcoming series.  His role, unfortunately, was not confirmed when the first 60-second show trailer was released this weekend (see "Full 'Star Wars Rebels' Trailer").  IMDB.com is also fueling the fire by listing James Arnold Taylor as the (rumored) voice of Kenobi for Star Wars Rebels.  Taylor voiced the Jedi for the Star Wars: Clone Wars series.