Perhaps Apple are saving this announcement for some new products? It would make sense because while you can put SATA drives on an SAS controller, but you cannot put those insanely fast 15,000 RPM drives on the inputs on the current MacPro motherboard. (oops- turns out you can with an iPass connector – thanks commenter Trancepreist(!!). Apple hiding this expensive feature still doesn’t make sense to us.
I did a full writeup at the "Other blog". See: