WotC has been including select third party products on D&D Beyond for some months now, including product from Ghostfire Gaming, Kobold Press, Critical Role, and others.
Monsters of Drakkenheim from the Dungeon Dudes (who are associated with Ghostfire Gaming)--who already have two million dollar Kickstarters to their name, with this one looking likely also--promises D&D Beyond support in advance. It's a 300 page monster book for their highly successful setting. There's also the usual selection of dice, minis, pins, bookmarks, dice bags, plushies, and so on.
150+ New 5e monsters inspired by Eldritch Horrors. Harvest felled foes to craft loot. Engage epic bosses. Explore forbidden lairs.
This is the first time a Kickstarter has included DDB support--you can't have a Kickstarter-funded project on DM's Guild--and it makes it clear that WotC is actively forming long-term partnerships with some publishers to expand the offerings available on their platform. To get the D&D Beyond version, you can add on a $35 VTT license (there are also Roll20 and Foundry options).