The Xbox One X supports freesync. The PS4 Pro might but I'm not sure

I think the GPU is capable of supporting it but its not enabled (yet) from what I have read online of people discussing this subject.

But so far there arnt any HDR 4k & Freesync tv's right?

Ah, gotcha.

It doesn't make much sense yet. HDMI 2.1 spec will be finalized and send to tv manufacturers in august. The earliest hdmi 2.1 tvs will be announced at ces 2018, likely high end models. Before devs can seriously start making games with freesync in mind it will be next gen. It would allow for some cool slow motion / stop motion effects or fast action segments. However until it is standard the most you can hope for is games running a little faster 28-38 fps uncapped, as they'll still be targeted to max out 30fps. (Unless it's a lazy mid gen upgrade without any extras, just let it run faster at a higher resolution with the same assets) At least screen tear will be gone and no more need for tripple buffering which will reduce input lag.

when I read stuff like this all I gotta say is... just buy a PC.

To be fair, I am also talking about the game developers adopting the technology by giving an option ingame so the player can choose freesync and uncapped framerate combo if the user has a compatible TV just like we seeing this gen with HDR.

For developers to jump onboard it would be only next gen that there is a possibility, altough is not certain given the information that hdmi 2.1 is still not in the new 4k tvs selling right now.

The amount of TVs sold each year is higher than the amount of consoles sold each decade. Most TV manufacturers won't add freesync to TVs just to appease a tiny minority of the market, so it probably won't have a big enough installbase to matter. Although I could easily see the consoles themselves having tha capability as they are going with AMD either way, I don't see developers using the feature.

HDMI 2.1 add more than just freesync. Dynamic high dynamic range (not a joke) and upto 8K60 and 4K120 support, BT.2020 16 bits per color and advanced object based audio. Game mode VRR is meant for both pcs and consoles and will work with existing cables. (You need a new 48G cable for 8k60 and 4K120 resolutions)

I don't think it will require a lot of work to add freesync if you're already supporting hdmi 2.1 There is no reason that modern panels work at a fixed refresh rate other than it's always been the standard. The bottleneck was always in the transmission formats based on CRT technology. There are hardware mods you can do on existing LCD panels to add gsync functionality.

But true, it's going to be a long time before developers are going to build games around it, like target 45fps or do some cool tricks with variable framerate. It would be an easy way to eliminate screen tear and switch of triple buffering for lower input lag. Perhaps it will be a system wide feature next gen, low input lag mode. I'm not sure if it will be all that great when games go between 25 and 40 fps, 45 to 60 would be better, yet somehow I expect 30 fps to still be the target next gen.