Bumping this to apparently confirm that rumor: Tesla has moved up the first deliveries of the Model Y to March 2020. You'll now see "mid-2020" if you visit the configurator, but that's still better than late 2020.
So long as the build quality holds up, this is very good news for Tesla... and arguably, anyone who was willing to buy a more affordable crossover than the Model X. It also bodes well for people waiting for the Cybertruck, although that's clearly built around a different manufacturing process.