Any plans for nunu and dr mundo ?

Riot doesnt have plans for Mundo, Mundo has plans for Riot.

They are on the update list,but we know that they aren't in the works and riot will likely only tell us about the next rework(the one after Urgot and Eve) when Urgot is about to get out.

https://boards.na.leagueoflegends.com/en/c/story-art/yghB24Gs-now-urgot-and-eve-will-get-their-long-awaited-vgus-can-we-have-more-info-about-other-candidates?comment=0004

Though I guess that Riot plans to keep Mundo a regenerating goofball who loves to hurt others and himself,since this is all part of his new Lore.

I believe after Evelynn and Urgot, Nunu is on the VGU list in the next duo. Dr. Mundo is a ways off.