I dropped by the Sacramento Best Buy at Arden this afternoon to check it out.
Approximately 30 retail boxes stacked, all of them the newer packaging with 1 year warranty.
Judging from the wording on the boxes, they're all just standard 120GB drives.
All of them (at least the twelve or so I checked) were 2MB cache.
If I'm reading it right, some are 60GB platters, and some are 80GB platters. Someone once told me to look at the serial number for the number of heads, and if he was right, it's about 50/50 4 heads (60GB) vs 3 heads (80GB).
A quick jaunt over to Compusa to see if the selection is better.
Four boxes on the shelves that I could find.
Same packaging, same model, everything the same except for the serials.
All had 4 heads, and all are 8MB cache.