The new R2-D2 type character for the upcoming "Star Wars Rebels" cartoon and the wider Star Wars universe from Disney has been shown off, called Chopper.

Chopper, aka C1-10P, is a lazy, cranky (if ultimately good-hearted) astromech droid and essential crew member of the Ghost (the Rebels’ starship) tasked with keeping the starship running and operable for its band of heroes.
The "Bumblebee" for the next generation of Star Wars perhaps? Can't be any worse than Jar Jar...