While I was browsing the web, I found some interesting insinuations about a possible Watership Down sequel. Unfortunately, I can't find neither a fix release date (from 2017 to unknown I find any number of things) nor a reliable source for the summary. Some post the movie summary, some the book summary and others post things from the series. IMDb also didn't help me

Only thing, I could find, is a (preliminary?) cover, which indicates, that it will be most likely a DTV-sequel.
...

Please don't shoot me

The idea to this emanates
this topic. I also was thinking, If I should post this on April, 1th and in the Honeycomb. But this could be too obvious. So someone else could think about an April fool hoax.