I dont think they are released yet. A few places have them listed as in stock, quanity of 1. I find that very hard to believe. A friend of mine that works at CDW gave me the price quote for it with no ETA on hand for the drive. Price on website is 136.99.
Maxtor is to release the SATA 9 series drive in April or so. Ive heard there are some issues with them currently, reliability or something (issues pertaining to all SATA drives, not just maxtor). There was a thread on this early today, might have slipped back a page or so.