I just signed up for the Founders program, installed the game and played.  Gameplay worked but graphics looked nowhere as I expected.  I went to the Benchmark menu item and found it was defaulting to DX11.  No matter what, I can't get Ashes to run in DX12 mode.  Even if I run the Ashes_DX12.exe directly I still get DX11 in the benchmark screen. 
 
System specs:
Core i7-4930K (OC to 4.6GHz all cores), ASUS Rampage IV Black ed.
32GB G.Skill DDR3-2400
2 x EVGA GTX 980Ti Htdro Copper
Win 10 Pro x64
2 x Samsung 840 Pro striped
LG 34UC97 (3440x1440), 2 x ASUS MX279 (1920x1080)
Liquid cooling: custom loop, 480 rad
 
Here's what I've tried so far:
1. Forum search.  No luck finding someone with my situation
2. Uninstalled Nvidia video driver completely, rebooted, installed driver v355.82 in 'clean install' mode
3. My main screen is 3440x1440 which I run in 125% font size.  Tried in full-screen, windowed, back to 100% fonts, disabled other monitors, tried 1920x1080.
4. Tried with SLI both on and off. 
5. DxDiag reports no issues
 
I'm out of ideas.  Where do I go from here?  One of the main reasons I jumped into the Founders program is to finally experience the glory of DX12.  Somehow I can't make it happen!