Gigabyte has the Gaming 8 and Gaming 9 with HDMI 2.0, but they are spendy boards: http://www.gigabyte.com/mb/aorus/Model
 
No one has DP 1.4 yet, not even Nvidia or AMD (their products are DP 1.4 ready but not certified).
 
What are you trying to accomplish? This cheap adapter will get you HDMI 2.0 from any DP 1.2 port: https://www.amazon.com/gp/product/B017BQ8I54
 
 

This is what I found out so far. AFAIK this is the only MB that will support UHD Blue-Ray play back (there are two others, read on).
http://www.asrock.com/MB/Intel/Fatal1ty%20Z270%20Gaming-ITXac/index.asp#Specification
 
While the HDMI socket is physically the same it supports HDMI 2.0a (the "a" being HDR support. Often the version type is not included in motherboard manufactures specifications). This is accomplished by adding a MCDP28x0 chip to the Motherboard.
http://www.tweaktown.com/reviews/8018/asrock-fatal1ty-z270-gaming-itx-ac-motherboard-review/index4.html
 
This coupled with Kaby Lake and the 630 integrated GPU, Pioneers BDR-211UBK, and Windows 10, will make playback with HDR possible supporting HDCP 2.2 and Intel SGX (which is something that needs to be turned on in the BIOS).
 
AND THEN I just saw this at Cyberlink's knowledge base which would include Gigabyte GA-Z270X-Gaming 8 and 9 boards. Check it out for there build requirements.
 
Would be nice to see EVGA offer a Mini ITX with this support :)