Spoiler obviously.

Who do you think got up and walked out of that bar? Heisenberg or Walter White?

The tagline for this season has been "Remember My Name" which seemed to have been an allusion to Heisenberg's "Say my name" moment from Season 5.0.

But after last night's episode I think that "Remember My Name" is more of a plea than a order.

After hitting rock bottom, hearing his son curse his name and wishing him dead, and his old friends declaring Walter White dead in spirit, I think that it's ultimately Walt who we've seen in the flashforwards and will charge into a final blaze of glory next week as penance for what he's done so far and as a desperate (likely futile) attempt to die a good man rather than a notorious one, as he now realizes he should have done before.