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.
If you're planning on being at Disneyland or Disneyworld soon, a whole slate of Rogue One theme park products have been announced for September 30! The pricing is unknown, but click here to see everything. A new Droid Factory 4-pack brings you C2-B5 (new), R2-BHO (new), R2-M2 (new), and R5-SK1 - which looks a lot like R5-D4. I'll have the skinny for you when I (hopefully) pick up my set in October along with (hopefully) R2-B00.
As I write this, auctions for R5-M4 are popping up. This may well be the first-ever action figure labeled "Star Wars Day: May the 4th Be With You" and is being reportedly sold in Orlando's Disney theme park(s). I don't have prices, I don't have specifics, I don't know if it's in Anaheim, and I don't have one yet myself. But I do know you can see one if you click here.
UPDATE: Long-time reader TotallyRawe left a comment indicating this is indeed showing up in Anaheim. Buy one! Or two, send me one. Happy hunting droid junkies!