BlueRaidervol :
It's a freaking mini-Display port for Video INPUT from the GPU to the Alpine Ridge Thunderbolt 3 Controller so that the Type-C/Thunderbolt 3 port can OUTPUT video.
I have a Gigabyte X99P-SLI Motherboard which has an Alpine Ridge Controller/Thunderbolt 3 and it has the EXACT SAME SETUP for VIDEO OUTPUT from the Thunderbolt 3 port (Display port input instead of Mini). It has nothing to do with Thunderbolt 2.
What an ignorantly specific and short-sighted use for this "supposed" mini-dp you have come up with... apparently your knowledge of computer hardware is a tad bit limited to your one single experience with using a completely different card in the past that was in fact equipped with a "FULL-SIZE Display Port"... which clearly illustrates, it is not the "EXACT SAME SETUP".
You do know what "exact" means? That's like commenting on a post about a GTX 1080 saying "DUDE, I have the EXACT SAME SETUP!"... "Well it's a GTX 780, but it's exactly the same brothalameu"... no, it's not.
First off... there is nothing about this card that is specifically targeted at video IN/OUT, nor is the connector limited to just one way transfer as you have implied... the use you have given might work, but it's definitely not the sole intention nor the primary of this card, which we don't even have exact specs on yet.
I was only agreeing that it was most likely a "mini DP" as that connector is synnonymous with Thunderbolt I/II. From now on, i'll be referring to it solely as a Thunderbolt I/II port.
Second, ALL Thunderbolt I/II cables use the mini-displayport connector... Apple is largely responsible for this for reasons I won't attempt to explain to you, but this extends to all Apple/non-Apple Thunderbolt I & II accessories as well. Google it.
I use a Thunderbolt II external RAID configuration with the Asus Thunderbolt II PCI card daily. It connects via (you guessed it) Thunderbolt II cable that is, dare i say, EXACTLY the same as a "mini display port" connector
This is merely speaking from factual experience though.
Just walk with me for a moment and think about it logically... This is a data card that plugs directly into the PCI slot of the mobo with the claimed use clearly being to add additional data ports. Being that this is a data card designed for Thunderbolt III connectivity, don't you think it makes more sense to include a backwards compatible Thunderbolt 1/2 port on a "Thunderbolt III" card???
Rather than, a very specific accommodation so that one random person can use it as a signal pass-through for video out via USB-C?
Do yourself a favor and run your monitors off your GPU output and if you need to utilize a video signal out for a capture device, you my friend are in luck, because Thunderbolt I/II/III should all work just fine for that as well.