We're coming up on the one-year anniversary of Wayfinder's Guide to Eberron being stealth dropped on the DM's Guild and I'm curious if WotC will do something similar this year. Last year, it was announced along with Guildmaster's Guide to Ravnica and dropped that same day. The GGtR was leaked the day before, and while the WGE itself wasn't leaked, Eberron coming to the DM's Guild did.
How likely is it that another campaign setting PDF will be released this summer? Which setting do you think is ready for the PDF treatment?
I'm of the mindset that WotC will be doing this going forward with old settings. Release a PDF to test out any new mechanics, open it up on the Guild, and release a hardcover or boxed set the following year.
As far as what setting they'll release, Dark Sun is towards the top of my wishlist. It's got more than a few mechanics that need testing, and WotC isn't shy about releasing a necessary class later on. It's certainly a possibility, how probable is a different story entirely.