I know it was added to deb-multimedia some days ago and it is also in the gentoo-multimedia overlay and on AUR. I think many distributions would consider mpv a

I know it was added to deb-multimedia some days ago and it is also in the gentoo-multimedia overlay and on AUR. I think many distributions would consider mpv a duplicate of mplayer, so for one to be packaged officially the other would have to be removed. Realistically that's not going to happen anytime soon.