I have seen it

So I was at my LFGS today and I got a good hard look at the Grey Knight codex.  I studied it, like the Art of War but in a hour's time because there was a hundred people there.  I only focused on what I deemed to be the most important and that was the actual Grey Knight units.  There was a lot of people looking at the book and I didn't care much for the Inquisitors and their items.  Overall, the book is almost exactly like the pdf, all the way down to the costs.  For more wargear info, check my previous posts.

Nemesis Force Weapons
Brotherhood of Psykers for Nemesis Force Weapon states that you take 1 psychic test for all models with a NFW. If you pass, ALL wounds caused by the unit count as Instant Death. Originally it was thought that you only get to blow up 1 guy, but now you can blow up an entire unit of Nob Bikers.

HQ Choices
The Grand Master is a solid buy because of the amount of weapon options you can give him.  If you keep the default Force Sword he gets a 3++ invul in close combat.  Since the Grand Master grants you Grand Strategy for 25 points more than a BC, you will never take the Brother-Captain.  What you will take is the Librarian because he's really good for his points.  The Brotherhood Champion is also a waste of space because he really does have 1 wound.

Special Characters
Every single one of them is trash.  Mordrak isn't a IC and his Ghost Knights have no Psycannons and cost the same as regular termies.  Crowe, aside from his ability to make Purifier troops, is utter garbage.  Seriously, the guy wants to die.  Stern is overpriced and useless and Draigo is just so damn expensive.  Then there's Thawn.. why does he even exist again?  Major disappointment here.

Strike Squads
Good buy overall.  I can definitely see 10 of these guys with 2 Psycannons and a Rhino as the staple.  Front-runners can take Incinerators, but Psycannons would be my weapon of choice.

Purifiers Squads
As predicted, these guys are the stars of the book.  Ld.9, 2 attacks each with 2pt Halberds and Cleansing Flame is just amazing.  They can also take 2 Psycannons for every 5 and you can take 10 dudes.  That means you can take a full squad of 10 with 4 Psycannons and Halberds, combat squad them so you have 1 squad of better Purgation dudes that can actually defend themselves and the other squad can go hang out in a Razorback or something.  Crowe can make these guys troops which is great.

Interceptor Squads
These are just Strike Squads w/ teletubby spikes and therefore they turn into Fast Attack.  They're good as last minute contending units that can shunt 30" once per game, so they're good as long as you have a Grand Master that can make them scoring.

Purgation Squads
Good buy as always.  Free Incinerators on 4 guys or Psycannons for 20ppm.  Equip with a Razorback and you're good to go.  I would personally always go for the aggressive Incinerator option but that's just me.  That comes out to 145 with the RB.

Paladin Squads
You pay for every cent you put these guys in.  Underneath that big bad internet hype lies a 2W Termie with a 5++ invulnerable save.  The +75 point Apothecary UPGRADE also weighs this unit down in terms of price.  Watch out for Demolishers and Vindicators..

Dreadknight
It's a good buy and effective unit.  WS5, S6, T6, I4, 4W, 3 attacks, 2+/5++ and a lot of weapon options.  The price of 130 is extremely cheap for what it does but if you want to upgrade it with the ability to teleport, be ready to pay 75 points for it.  Personally, I'm not going to be picking any of these up because I have this little thing called aesthetic preference.

Rad Grenades
-1 Toughness to anything in assault with the bearer of these grenades.  Yes, they do effect the Instant Death threshold.  Yes, this does mean that your S10 Daemonhammer auto-rapes T5 Trygons.  These little buggers change the outcome of every assault, and that's why they cost 15 points to equip on very select HQs (like Grand Masters).

Psybolt Ammo
+1S to Bolters, Heavy Bolters, Storm Bolters, Hurricane Bolters, Auto-cannons and Assault Cannons.  Use these to turn your Assault Cannons into Psycannons or your Riflemen Dreads into objects of extreme fear.

Oh, and here's some pictures of the space monkey and Crowe: