The less I say, the better - because there are 4 items to buy with a grand total of 8 new robots. The good news: there's finally going to be an easier way to get Chopper, and that super-articulated C-3PO you like is coming back in style. With blessed little competition from Hasbro these days, you'll probably have the scratch to pull these down.  From the Disney Parks article:

This month, Cody is part of a team rolling out a limited release, boxed set with four Astromech droid action figures inspired by characters from the animated series, “Star Wars: The Clone Wars.”

Additionally, three limited release action figures are making their debut including C1-10P “Chopper” from Disney XD’s animated series “Star Wars Rebels;” a two-pack featuring R2-D2 and C-3PO celebrating the 40th Anniversary of Star Wars: A New Hope; and a red Protocol droid, R-3D0, that was briefly seen in Star Wars: The Force Awakens.

“This is the first time we’ve introduced Protocol droids to the Star Wars Droid Factory collection,” continued Cody. “All of these pre-packaged figures have interchangeable parts that can be mixed and matched with action figures created at the Droid Factory.”