Not too much has actually changed with the body. The curves are slightly more exaggerated and the comfort cuts are a bit deeper. Apart from that this is still the same Alder body that has been used on strats for years.
Fender have made a lot of changes here. The most visible one is that they have moved the truss rod adjustment to the bottom of the neck. Previously it was at the headstock and was a real pain to adjust once strung. With this new position at the body however you can easily set up the neck absolutely anywhere.
It does not end there however is they have also constructed a new compound shape neck to match the compound radius fingerboard. Now the neck carves from their Modern ‘C’ shape to a very modern ‘D’ carve so you get great control over both ends of the neck. This matches up perfectly with their compound radius fretboard that goes between a vintage 9.5” radius and the low end to a shredtastic 14” at the high end.
The idea here is that these changes will make it easier to play solid rhythms and insane leads on the same guitar. There’s not much you can’t do with this guitar out of the box.