Netapp's got this exactly right...
"PAM II was announced last Friday and provides up to 4TB of single level cell (SLC) flash for a controller. It accelerates read I/O for everything in the attached array that is accessed through the controller."
This is exactly the right way for NetApp to use Flash, and a SAS SSD would be exactly wrong. Netapp is a NAS vendor after all, why on earth would they incorporate Flash as a SCSI block-device on SAS when they can put it on the (orders-of-magnitude-faster) processor local bus???
I'm guessing NetApps pre-announcement is just there to quiet down the unknowing folks who don't yet understand why it's really dumb to put fast silicon storage behind a serial SCSI inteface.