Hey everyone, Xethik here with some news. The Grey Knight FAQ was released this morning, which can be viewed here:
http://www.games-workshop.com/MEDIA_CustomProductCatalog/m1830601a_Grey_Knights_v1_0.pdf

I don't have time to look at it myself right this moment, but I will be doing a complete rundown tomorrow afternoon. Until then, take it apart yourselves.
EDIT: Fixed a typo. That's what I get for blogging at work!
Xethik