The 'Compendium' term can be misleading but it is actually a Roll20 type of package. It's not a compendium of all MME books. By Compendium, this means MME1 will be integrated directly into the Roll20 website. It won't just be a 'pdf' or 'mod' for Roll20. Think of it like being a book in D&D Beyond that you can access easily via the web that you can share with your players, except it's in Roll20.
Monster Manual Expanded II 2nd Edition (Update 3) Art Preview #54. Just a few art pieces left to be done. Here is a pair of small critters I felt needed to be updated to match the 5e artwork: the Berbalang Lore Master and the Boggle Trickster!