PDF Datasheet
http://forums.storagereview.com/index.php?app=core&module=attach&section=attach&attach_id=59

linked from http://www.theregister.co.uk/2010/04/06/velociraptor_gen_5/

Pretty slick, only 15% faster though, I figured for sure they would have upped the RPMs though to be better suited for the SATA 6 interface.

Tom's has a review, if you can stomach their s(h)ite.
http://www.tomshardware.com/reviews/wd6000hlhx-velociraptor-600gb,2600.html

Looks like a winner, hopefully the 600GB version comes in at under 300$.

Looking forward to some benches with this drive. I would expect the $$ to be lesser than a good SSD but we'll see.

I would certainly consider one if the $$ is good.

The Tom's link is a full review with all sorts of graphs. Although it doesn't compare it to any SSD's.