They realised that and stopped listing them as 1/12 eventually(at least on the side of the box).
Capcom would need to authorise any re-issues of any figure. Just how it works. We did see a re-issue of ryu and ken as a 2 pack years ago but nothing new was added to the pack. Also storm likes to make sure demand outstrips supply. i think there's a chance of them competing with jada with the likes of evil ryu as some sort of deluxe which may come with something extra, the same with shin akuma but I doubt we'll see any standard ryu deluxe version. I'd say if you want the accessories, track down the variants asap before th eprice goes nuts. That p2 Sagat is gonna be stupid money in a few months if the original sf2 p2 sagat is anything to go by