Amazon does that now as a matter of course - maybe I just manage to order obscure Prime items, but it's common to see the order summary show a date > 4 days out, while having the Prime 2-day shipping also checked.
Same here. It's been a bit disappointing. I've been considering canceling my Prime membership, especially since I don't use any of the other Prime perks. But I'll wait this year out to see if it improves.