I have to say I'm struggling with what FlashRay was meant to be. The specs issued show the hardware as a "6U controller" and 2U disk shelf. What the hell is in 6U as a single controller? Now, it would be more understandable if the 6U represented dual controllers in a single node (with integrated disk), but that's not how it has been described.
From the tone of this article, it appears FlashRay may have always been a development exercise to create new software features to integrate into the existing platforms. If that's what happens, it represents a major mistake from NetApp. Continuing to develop a 20+ year old architecture is chasing an impossible dream.