Just an update, I'm nearly through the next slog of D&D creatures and I'll release the creaturepack pretty soon; you can feel free to use whatever you like and I'll send you an advance copy if you want before I release it. It also does include a few custom non-D&D creatures but I think they're worth including since many of them are awesome.
A small list of stuff I've added:
Drow (playable, with full custom entity)
Driders (playable in adventure mode)
Centaurs (playable)
Bugbears (playable)
Hobgoblins (playable)
Orcs (playable)
Halflings (playable)
Derro
Mountain gnomes
Tons of underground creatures (gricks, darkmantles, otyughs, etc)
Many oozes and slimes (incl. gelatinous cube)
Many new castes of goblin (redcaps, mountain gobbos, jungle gobbos, etc)
Way too many varieties of dragon
Lots of sprites/fey (nixies, dryads, grigs, etc)
Giant worms (purple worm, remorhaz)
Good outsiders - basically opposite of demons (archons, etc)
Bunch of aboveground monsters (owlbears, etc)
Domesticated subterranean creatures - most of these are custom (rat spiders, giant orb-weavers, rock spiders, riding lizards, etc)
Lots of new magma creatures (including the terrifying giant magma spider)
And my personal favorite, the much-dreaded Purring Hornet, which is a dragon-sized insect that is the result of a Purring Maggot reaching maturity. It's basically a buzzing mass of tentacles, acidic ichor, and chitin as hard as obsidian.
And more to come, I'm really just getting started. Once I get focused I can crank out about 100 new entries in a weekend.