If you're determined to get a 60cc saw there's no way I would get the current 562xp. They've made far too many updates and improvements to the Mk II to overlook it.
Dealers know about it but they want to get rid of existing inventory before they put it on the floor. Some play dumb, one of my local dealers was blunt when confronted and just said they're not ordering new saws until the old saws are sold. That said, deliveries are expected to start in early Q1 2024.
I should also point out that the MS400 is a bit lighter than the 562xp, more powerful and currently available.