I tested this out. 100% can confirm that both cross play and universal progress works. I played a bunch on PC last night, logged into the ps4 version today and had everything I got from PC.
Also this game is fun As fuck. Launch week server issues are a thing though. Don't think they were expecting this much of an increase of players from beta to release
Has finally left beta today for a full release. Its epic store only for PC, BUT...
There is full crossplay and cross progress on pc, ps4, and the xbone
For those who dont know, dauntless is a f2p Monster Hunter style game.