@Johann: Dont expect 1,5 & 2TB drives unless ONTAP 8 is at least somewhat production ready as the aggregate limit of currently 16TB would result in about 8 or 9 Data 2 TB data drives which would significantly affect the performance
Smallest ONTAP 8 capable systems (FAS2040 & FAS3140) will have 40TB aggregate limit which results in over 20 data 2 TB disks (we already tested it with a 17TB vmware datastore in our testlab using 8 RC 1 ;-).
As for 600GB SAS drives, expect them in 15k flavor only, anytime soon possibly.