We were right. Sort of. We knew there had to be more to the $999 Apple RAID Card. Thanks to commenter Scotty, we now do. It turns out it is an SAS controller as well. Meaning you can plug those wicked fast 15,000 RPM SAS drives into your motherboard.
Perhaps Apple are saving this announcement for some new products?
I did a full writeup at the "Other blog". See:
Apple Mac Pro RAID Card is an SAS controller.