I was just quoting from the press release. It must be misleading!
"Calibration" is distinct from "profiling"; the imagePROGRAFs and several of HP's desktop printers have calibration—they can get back to a known state. The Z2100/Z3100 and the 900-series Epsons offer profile creation.
What would be the advantage of an internal hard drive?
Spooling up multiple huge jobs, and the ability to re-run jobs directly from the printer until you're blue in the face. The iPF9000 (60" imagePROGRAF) has had one from day one, for example, so you can spool up all your bus-sized prints at once instead of sitting around waiting for the previous job to finish.