So recently I heard a quote from the Doctor, saying that he might visit some familiar faces, possibly referring to his regeneration. Is it possible for a Time Lord to regenerate into a previous form of himself? How does this work? If it is possible, would it be via a meta crisis or something like that?
We don't know.
So far, this hasn't happened in canon, but nor has there ever been any canonical statement that it can't happen. Thus any speculation on whether or not it can or will happen, and if so how, will be just that: speculation.
The closest we've got is the Twelfth Doctor wearing a face that he'd encountered in one of his previous incarnations. He says that he chose this face to remind himself of the events in Pompeii. If it's possible for him to choose a new face for himself, one he's seen before, then it may also be possible for him to choose one he's been before. (Perhaps he'll return to the face of David Tennant, in order to remind himself of the wonderful days before he kept having to reboot the universe every season or two.
The quote you're thinking of is this:
DOCTOR: I could be a curator. I'd be great at curating. I'd be the Great Curator. I could retire and do that. I could retire and be the curator of this place.
CURATOR: You know, I really think you might.
(Yes, that is the current silver haired version of the fourth Doctor you just heard. There's Tom Baker, leaning on a walking stick.)
DOCTOR: I never forget a face.
CURATOR: I know you don't. And in years to come, you might find yourself revisiting a few. But just the old favourites, eh?
(The Doctor winks.)
-- 50th anniversary special, The Day of the Doctor (emphasis mine)
If this really means that the Curator is the Doctor himself, returning to his Tom Baker form after many regenerations in the future, then the answer to your question would be yes. But the Curator was cagey enough that it's not quite made clear if this is really his meaning, and presumably this was deliberate both in and out of universe.
Out of universe, probably not.
Some of the actors who have played the Doctor are already dead, and most of the others look much older now than they did during their days in the TARDIS. More to the point, most of them have moved on to other things. Returning to Doctor Who would be a big (and unprecedented) career move, and they might simply not be interested in doing it.
Another factor is how it would be taken by the fans. So far we've been able to pair up every actor's name and face with a regeneration number (even John Hurt aka Mr Eight-and-a-Half-or-Something). The return of a previous Doctor, who naturally will have been loved by some fans and hated by others, is likely to be greeted with a mixed reception at best. Not that that's stopped the show from making major changes before and irritating all the traditionalist fans ...
<cough> sonic sunglasses