Steve Evans, Design Director for Star Wars at Hasbro, revealed on his Instagram account that the just announced R2-D2 for the 3 3/4" Vintage Collection next year will be released on a classic ANH card.
We did some digging and it looks as if the R2-D2 figure itself will be a re-release of the Entertainment Earth exclusive Force Link 2.0 R2-D2 figure which is packed-in with C-3PO. You can get the set here: R2-D2 & C-3PO at Entertainment Earth. For more images of R2-D2 take a look at the database entry or scroll further down.
For a list of all 3 3/4" R2-D2 figures have a look in the database here: R2-D2 figures.
Pic credit of the Kenner R2 goes to Chris Fawcett's 12back.com.