The Forsaken Systems Player's Guide for Warhammer 40K introduces 20 new Archetypes, new Wargear, Abilities and Psychic Powers. It also adds Ogryns, Ratlings and Kroot as playable races.
The PDF version of Wrath & Glory is out, and there's a free adventure called Graveyard Shift, are taking pre-orders on the physical book and they're still working on both an errata and a log of changes from the original Wrath & Glory and theirs.