Pictures have leaked of the 390X cooler and it looks like it's another Asetek design like the 295X2.
http://www.overclock3d.net/articles/gpu_displays/amd_radeon_r9_390x_cooler_leaked/1
http://www.overclock3d.net/articles/gpu_displays/amd_radeon_r9_390x_cooler_leaked/1

Thursday, August 14, 2014 — Asetek® today announced that it has secured a design win with an undisclosed OEM customer for a graphics liquid cooling product. The ambitious project is forecasted by the customer to result in 2 – 4 million dollars of revenue. Shipping is scheduled to begin in the first half of 2015. The design win continues Asetek’s success in the growing graphics liquid cooling market.
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