Appears to be missing most of AD&D (1e): the Dungeon Master's Guide, Player's Handbook, Monster Manual, Monster Manual II, Deities and Demigods, Rogues' Gallery. How is this "Every Edition Available Again"? I don't understand.
That's my observation as well. Perhaps they mean "something from every edition is available" and intend to dribble out the content in an attempt to make the site something gamers revisit to see what's newly re-released?
Dieties and Demigods (hardcover printing, no Cthulu/Elric) was there this morning.
Deities and Demigods w/ Cthulhu/Elric will mostly ever be a private-scan or print only version.
When the announcement of this plan was made at last year's GenCon, they were very clear that more books would be added as time went on, likely in short order. It's a pretty big catalogue.