I received a shipping notice from Apple at 9:05am EDT claiming delivery on Monday (4/27). UPS tracking is working, but they have only the label, no date so far. The label is for Next Day Air Saver, however, so I expect Apple's 4/27 claim to be correct.
For the record: I STILL consider this a botched launch as a general observation, and will not be preordering another Apple product until I know for sure this won't be the new status quo for preorders. But feeling just a little less irritated now that I know this model was only delayed a couple of business days, and not two weeks or more. Hopefully any remaining :01s through :04s will get good news soon.