Mecheon
Sacabambaspis
Spelljammer stole the Star Frontiers races decades ago.And yes, I know Star Frontiers isn't D&D but some of the races were converted to D&D and they have a "new" setting planned for next year that could very well be a Science Fantasy setting using Star Frontiers as the foundation for the setting.
Anywho, Spelljammer's guaranteed, outside that nothing's 100% but I suspect some planer stuff. I'm also not sure if there'll be a MTG based one, as the MTG sets we know of don't seem as D&D-able as previous. Dragonlance is a semi-valid guess due to the novel, Planescape's another very likely guess (And honestly a bit more likely than DL showing up, novel aside)