Out of the names I've seen mentioned so far I'd have to go with, in order...
1. Rian Johnson
2. Abrams
3. Michelle MacLaren
4. Ron Howard
5. Ava DuVernay
Abrams can't write for sh*t, but with a story/script already close to being locked, all he'd have to do is direct, and he's at least damn good at that. Still, I'd put Johnson ahead of him (for now). I'm seeing a lot people throwing out a few female candidates as well, which could be cool, as MacLaren, especially, is a seasoned Game of Thrones / Breaking Bad / Westworld vet, and could really kill it.
Still, I have a feeling it actually won't be any of the names above and instead someone currently off the radar but ultimately a no-brainer.