1. xfce is really not an important project IMHO, it’s an interface from the 00’s that doesn’t have a clear usecase to me at all. It’s a strictly worse version of KDE in my eyes. The only reason to use it seems to be if you’re already used to it and don’t want to have to change anything.
2. they’re actually almost completely done: https://wiki.xfce.org/releng/wayland_roadmap

so, i don’t think it’d matter if it were true, and it’s also false.