In other words, they will be made for the US. Full-hybrids will not be able to be sold in the EU post-2032 (and that's probably the reason why the 1.2 FHEV seems to have been axed)
It's not early for a Purosangue M, 4 years is a typical lifecycle for Ferrari. As for the March launch, I think that if it was the V6-only we would have more news about it. But anything is possible