There aren't. And it'll be pretty obvious to see on this wiki if there is. Check the KFP News forum category for franchise updates.
Also, if you see any news articles on Google saying "KFP4 Confirmed?" or "KFP4 Release Date" or whatever else, and it's dated to before this year, it's speculative clickbait. Nothing has been officially announced by DreamWorks yet.
Actually I think dreamworks is going to make 3 new movies for Kung fu panda franchise.
^ That statement was made about 10 years ago by the then-CEO Jeffrey Katzenberg, and the statement was more along the lines of "we have enough material in this story arc for 6 total films." It doesn't necessarily confirm a slated 6 films, especially with how many changes DreamWorks has gone through since then.
Also, apparently Jack Black has said recently that he's doing only a handful of things before he retires, one of which he specifically stated was 1 more KFP film. Not to imply that he calls the shots necessarily, but I think that statement could mean something for current execs at DreamWorks or NBCUniversal. Who knows.
Anyway, nothing is slated, that's the point I'm trying to make. KFP4 isn't official until DreamWorks has made an official press release about it, which hasn't happened yet.
It's possible for a 2020 release, Jack Black hinted at it at one of his recent YouTube videos, I have made prediction videos and so has a very good friend of mine. I'm hoping for it to be the last film. Kill shifu off and Po and Tigress finally become a couple. I hope it's like HTTYD: The Hidden World
^ You've already described the perfect ending (imo).
^ I wouldn't be so sure about that if I were you.
^ ... Why?
I think Brie Larson and I can play as Master Tigress' younger siblings to join the team in Kung fu Panda 4, and please make it happen Universal and Dreamworks and Disney.
What do you think?