Although MTV hasn't given its greenlight yet, Bunim-Murray Productions is already accepting applications for The Real World 21 and Road Rules 15. Check out their website, which has a small casting notice.
This would mean that Real World would continue going after its twentieth season and sixteenth year. Also, ever since Viewers' Revenge mostly disappointed fans, there hasn't been much talk about renewing the series. At least not yet. The casting notice suggests that Road Rules may very well be brought back as well.
So far, Hollywood and Gauntlet 3 are the last two productions to be filmed.