The first I heard about finecast was recently on bols just before the GW announcement, I have to say it was a fairly well kept secret from GW in the grand scheme of things and considering how badly they seem to be able to keep the secret of the rest of their products.
They have been seen ages ago on various forums but now they are finally on advance order, the razorwing, wracks, grotesque and haemonculus join the venom talos and scourges.
My flurry into the world of Chaos Guard begins....