So they just gave the title and showed the cover mock-ups; no specific info till Monday?
Based on recent D&D Beyond interviews, I’m expecting we’ll get info on the Gith vs. Illithid conflict, the Corellon vs. Gruumsh vs. Lolth conflict among others. New Race options ate mentioned, which I’m sure means the Gith race and various elf subraces that we’ve seen in UA. Fingers crossed that one of the conflicts covered is Eberron’s Last War, which would be an excuse to get Warforged in an official published product at least, and maybe some other Eberron races as well. I would be thrilled if Nentir Vale’s Dawn War gets a mention. That would actually be a good excuse for them to include the Shadar-Kai, since they really have little to no connection to the Corellon/Gruumsh/Lolth conflict but are closely tied to the Raven Queen, who is from that pantheon originally.
Probably also worth mentioning that they teased some big announcements for DM's Guild in the coming months that they seemed excited about. I'm guessing, based on the conversation, that they will be opening up additional properties beyond FR and Ravenloft.
AD