The new 40-page manga chapter will supposedly be released on February 10 (not April 1st ), in the LalaDX magazine. I can't find any confirmation on what the special extra chapter will be about.
I don't study Japanese anymore (and I've forgotten virtually everything I knew), so I can't provide a translation of this image. But I actually hope this isn't just a rumour. If I'm wrong, a moderator should take down this post so I don't unwittingly spread false hope