I'm still not so sure he is half-human. But they'll just leave that one as an unanswered question because it's better than dealing with potential continuity issues (though with Doctor Who, continuity issues are just part of the program).
I'm interested to see what happens with Me next, especially as she now has a TARDIS. I wouldn't mind more of her in the show. I am interested, though, to know how she knows so much about Missy (and to even call her that).
The Doctor's fate is also a bit different from Donna's... supposedly he can't remember Clara at all, and nothing can change that. With Donna, all the memories are intact, just sort-of blocked, but could come bursting out if they're triggered.