He doesn't seem to very much (not seen at the Forums since early August), instead seemed mostly to be checking for bugs and performance issues when he did. He has a new game that he's hard at work developing and the v1.6 update for Stardew Valley will be focused on modding, so the Game Suggestion section here is nice but I doubt will result in any new content for Stardew Valley.
However I'd love to hear from someone else who isn't as much of a stick in the mud as I am!