They're going to start selling ebooks again next year.Do you think we can safely assume that any D&D setting mentioned in the rules is going definitely to be republished at some point? FR, GH, and DL all referenced multiple times in this section, along with classic pantheons. Everything else: not so much.
If I can take a guess, it is going to be -more or less in order- FR, Greyhawk, Eberron & Dark Sun
Oddly enough, there are no Eberron deities listed in the deity archetypes in the last version of the playtest document.
Regards.