Book about psionic powers as a prelude of the revival of Dark Sun.
Planar handbook and modules about planes. Practically the return of Planescape throught the back door. After Baldur's Gate III the next one will be a new Planescape videogame.
Iomandra, the homebred Chris Perkin's setting as a reboot of Councyl of Wyrms.
Sequels of Curse of Strand: The House of the Gryphon Hill and Bleak House, the death of von Richen. The next year may be a compilation of the modules about the grand conjuction.
Kaldheim, the new setting of Magic, or maybe Eldraine, the other plane based in faery tales, from Magic to D&D.
More easter eggs about Spelljammer or even Gamma World, or the fraals, the little gray men from d20 Future, as "guest artists".
UA about martial adepts and martial maneuvers, special powers in the middle between at-will and once-encounter. PC races based in Asian cultures, for example dragonborn with lung (imperial dragons) as ancestors, shens as little brothers of the dragonborns, korokoburu as little humanoids with hats by leaves as traditional clothing (an cultural icon), tsukukogami as new PC race of living constructs about old objets whose "soul awakes up". Other new PC race will be the dokkaebi, as faes cousins of the tielflings.
News about a new future videogame adapting Dragonlance, and a videogame based in a fusion of Gamma World and "hasbroverse".
In the next April's Fool a new PC race, a half-cybertronian symbionts, the cyberpartners, for those naughty pervents who miss Transformers-kiss players line. But this time will be something allowed for all audences, and the magical-girls enoughly covered and dressed.