A January 2015 set gets revealed by MTV. A giant show only Chopper ius also on their site.
The press release on the Wookiee gunship is below:
Protect Wullffwarro and his Jedi friend, Kanan Jarrus, with the powerful LEGO® Star Wars Wookiee Gunship. As featured in the Star Wars: Rebels animated TV series, this amazing battle-ready craft has loads of weapons to see off any invading force, like movable front cannons and an elevating top cannon. When the action really heats up, raise the wings into attack mode and unleash the never-before-seen rapid shooters! If you run low on ammo, open the side hatches to access the spare supply, then lower the rear bay door and unload the mobile gun post. Includes 4 minifigures with assorted weapons: Wullffwarro, Kanan Jarrus and 2 Wookiees. Available January 2015, 570 pieces, $69.99 USD