The psionic races are the ones from 3.5 Expanded Psionic Handbook: dromites, elans, xephs, maenads or from other source, for example the synads from the complete psionic.
* We haven't seen a book about monsters since Moderkainen's tome of foes. After Tasha's book is too soon for other sourcebook about "crunch", and the first book for 2021 is almost modules/adventures compilation. A monster compedium about undeads, a new Libris Mortis? But a new Draconomicon would be right if Dragonlance comes back soon this year.
*If it is a new M:tG setting then the candidates are Eldraine, Kaldheim, Innistrad and Stryxhaven. Innistrad is too close to Ravenloft.
* The Hollow World fro Mystara is perfect to create a setting with a style of Hyrborian adventures (Conan the barbarian and company)
* If there is a reboot of Ravenloft then others are possible, even Planescape, where the Faction War didn't ended in Sigil, or at least it isn't allowed openly.
* The planes are too dangerous hazards for low-level players. This may be a handicap.