With GDC happening this week, AMD took the opportunity to
announce the Radeon Pro Duo, a dual Fiji GPU graphics card. If you happen to have $1499 USD to spare, the Radeon Pro Duo is now their top-of-the-line graphics card. The Radeon Pro Duo is capable of an incredible 16 TFLOPS of compute performance. With this expensive graphics card, it's water-cooled similar to the Radeon R9 Fury X. The Radeon Pro Duo will begin shipping in early Q2'16 at $1499. While most Linux gamers/enthusiasts don't have that much to spend anyways on a complete system let alone a graphics card, the Radeon Pro Duo likely won't be worthwhile under Linux.
It is primarily a piece of kit for VR developers - so more of a prosumer segment bridging consumer and professional segments. I don't think the card is being marketed for gamers (although it wouldn't surprise me if AIB's like Asus took the opportunity to do so in some guise), more a compact single solution for a one-GPU-per- VR screen developer. Price wise, it wouldn't stack up well against two FuryX/Fury/Nano in a gaming comparison, but I'm betting gamers won't be the primary marketing focus.