If you look at the patch notes for release, they added some armor models and paln to release more. Weapons, too.

I do not think they plan to add any other playables, but they have stated in several places that they plan to eventually release all enemy factions through the season updates, for some more varied purging. I believe that the next faction planned is the Dark Eldar.

And yes, thank you guys for the awesome game!!

It is really nice to see positive comments about this game. I am a graduate of Diablo 3, Grim Dawn, and Destiny 2 maniac comments on their forums.  The games, all fantastic and magical in their own special ways, suffered immensely in the Forums.  I firmly believe if you cannot say something nice about a game,  don't like it, or only wish to complain about its mechanics,  you need to just put it down.  I think I might have found a new home here in this amazing game.  I am an old guy, but young at heart.  I am having a terrific time trying to figure out getting past all the waves in the 5th chapter.  Constantly getting killed.  Yet the game keeps drawing me back with its magic.  Just wanted to give a personal "Thank You" to the wonderful programmers, artists, writers that struggled so hard to produce this masterpiece. As I said, I am an old guy.  Not too healthy due to stuff that happened many years ago in Vietnam.  But what few years I have left will be much more enjoyable thanks to you marvelous, talented people!!!!  God Bless all of you!