In case you haven't seen them, here they are. Here's what I think of them.
Ravener: Not a huge fan, but at least they'll blend in perfectly with the old metal ones. I'm not a big fan of the Warrior head, I hope there's more options.
Gargoyles: I'm glad they're finally plastic, and I like everything but the wings. They look a little too...undead. I'll still buy bucketloads of them, however.
Venomthrope: Ok, wow. This looks so much better in the Kraken color scheme. It brings the detail out better than the Leviathan scheme. I love the tangle of tentacles.
Hive Guard: The picture really isn't clear on this one. I'm not sure if I like it...is this a quadruped Tyranid? I like the upper body, but I'm not sold on the lower. Also, I thought this model was supposed to be very top-heavy? Doesn't look so.
We still have yet to see the Trygon or the Pyrovore, let's hope those come out soon!