Yeah I like to see some setting diversity in the new books from the get go. As I've said quite a few times the core books dont have be the traditional 3 cores at 300+ pages. They could do shorter books at a lower price point. Equipment from specific settings for instance. Same with races, classes and backgrounds. Who knows what it would look like, but I think there is a lot of things they could do to restructure the format of the core books. OTOH, I'd also be happy if they expanded the size of the 3 cores and sold them at a higher price point where needed. If they are unwilling to break from tradition here Im going to question if Im even interested in this next edition.I'd like to see mechanically dfistinct equpment lists for darksun FR & eberron from the start rather than an equipment lit for FR & "your the gm you fix it" after the baseline is set too high in one area or another. Cantrip wands & eternal wands rather than just innate too
Ideally, such lists should be in the relevant setting books, though.I’d like t he equipment list to be modular.
Playing a medieval-esque sword and sorcery? That’s what the base equipment list is there for. Playing a Forgotten Realms-like high-fantasy setting? These items are also available. Play an Eberron-type magiteck setting. This third list got you covered.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.