Parmandur
Book-Friend, he/him
Planescape seems the most likely next year, mainly because I could see the same format from Spelljammer working very well with that Setting.Do you think so? Sure, it isn't impossible, but as someone who loved both Dark Sun and Planescape back in the 90s - I think it would be relatively easy to do a Planescape 5e that was both true to the original 2e setting and to the general milieu of 5e. Making a 5e version of Dark Sun that achieves both seems dramatically more challenging to do - but I would have put Dragonlance on that list as well, and here we are.