I don't think the OP is asking about the list of new features in a release. They were asking if and where the list of "most requested features" for the next release is and if it is possible to add to or vote for things on that list.
Andy, I believe that you are correct. Certainly
PGM Released this statement about the 2020 release. This discusses delivery of 49 requests, but definitely not 49 of the "most requested features".
'New' features and 'most requested' features are a very different thing altogether.
I may be wrong, but I cannot recollect seeing some of these items in the wishlist requests section. But because it states "List of 49 Requests fulfilled in Band-in-a-Box 2020 for Windows", I presume they are all there.