I know progress on that has been slow, but I look in on it every now and again and work does seem to be steady in porting their core components.
I'm not sure if they're settled on a compositor yet. There was talk (from the Ubuntu MATE devs) about using Mir, but I haven't heard anything about it in ages, and the Mir suggestion was at a time when wlroots was in a much less mature position. With XFCE, Budgie and Raspberry Pi OS all now going the wlroots direction, it's not inconceivable that MATE will go the same way.
I know progress on that has been slow, but I look in on it every now and again and work does seem to be steady in porting their core components.
I'm not sure if they're settled on a compositor yet. There was talk (from the Ubuntu MATE devs) about using Mir, but I haven't heard anything about it in ages, and the Mir suggestion was at a time when wlroots was in a much less mature position. With XFCE, Budgie and Raspberry Pi OS all now going the wlroots direction, it's not inconceivable that MATE will go the same way.