I wonder if they'll pick up the Quantum stuff in future film. Goldfinger, Connery's third was a self-contained story (Although it would influence pretty much every later Bond), while all the other 1960s stories dealt in some way with SPECTRE. So this could be a similar thing. However I heard Jesper Christensen will probably not want to do Bond again, he hated working on the last two.
Same thing with Felix, Wright isn't in this one from what I've heard but the other "Felixes" weren't in a lot of Bond films either (In fact I'm pretty sure the character sat out most of the Moore era until he was reintroduced in the Dalton era, and nothing about Felix is in the Brosnan movies, where we had to settle for Joe Don Baker instead).