We've already hit you with a one-two punch of variable fonts today. Robin shared Richard Rutter's post on real-world usage of them. Ollie Williams introduced us to the in's-and-out's of using them on the web.
I figured we'd make it a trifecta and link up our discussion about variable fonts with Jason Pamental. Dave and I talk with Jason for an entire hour digging into the real story, possibilities, and future of all this variable fonts business. Don't miss his or Mandy Michael's demo Collections either.