Two 750GB models have already shown up on the Seagate website. The Barracuda 7200.10 ST3750640A (PATA) and the ST3750640SA (SATA) will be two new models we can look forward to seeing this year. The Seagate webpage reveals dozens of other NCQ-ready 7200.10 based products ranging from 200GB on up. Cache information was not available via the website yet, but the official Seagate PDF claims the Barracuda 7200.10 series will come with 16MB and 8MB buffers. Considering these two drives will be the best of breed for Seagate, it is fairly safe to assume these drives will have 16MB caches.
Whew, just when I was starting to think 500GB was the bomb. Check out the full news posting at DailyTech.