Unsurprisingly, Nvidia clarified that they have no plans to support Adaptive Sync/Freesync

http://wccftech.com/nvidia-plans-support-freesync-displayport-adaptive-sync/

(Original Article): http://www.sweclockers.com/nyhet/19941-nvidia-inga-planer-pa-att-stodja-freesync-och-displayport-adaptive-sync

Well know it will be a battle between royalty-free adaptive sync and Nvidia's proprietary and costly g-sync. Who will win this battle? Stay tuned throughout the year.

I thought this was public knowledge though lol, this is one battle Nvidia is definitely going to lose, especially as of late with the disappointment with the GTX 960, the memory bugs with the 970, and the added cost to implement G-Sync compared to Free-Sync. the only time Nvidia will support Free-Sync is when the sales of G-Sync drop down the toilet compared to Free-Sync based monitors. which is very likely, considering AMD's Free-Sync monitors are cheaper.

This is going to be an interesting battle between AMD and Nvidia.

>which is very likely 

knowing how Nvidia likes to sit on ass and how their customers have a hard ons everytime they release something new I don't think they'll budge unless there is an explicitly clear advantage to get freesync (implying I don't think price is going to be enough, I hope I'm wrong though, I want Nvidia to support more open things)

The advantage I would say that Nvidia has is the fact that there are more owners of Nvidia GPUs than owners of AMD GPUs but even then not everybody will spend ridiculous amounts of money for G-sync monitors, especially with the fact that there is a free alternative.

If AMD does something mind-blowing with the AMD R9 300 series, then people will really start to vouch Nvidia to support adaptive sync or move to AMD which will hurt Nvidia in the long run.

I found an article confirming this in september of last year. Kinda sad that website rehashes this topic to make it seem like it's new news. Ars does this also. 

Article in question: http://www.guru3d.com/news-story/nvidia-not-going-to-support-vesa-adaptive-sync.html

I heard that free sync was going to be an added cost, although not as much as g-sync to my knowledge. Something about it being an optional add on to the displayport standard so an added cost. That might be dated info but possibly still relevant. 

Well looks like more for AMD/Intel

Freesync was already a VESA standard so any DP 1.2 scalar already should have adaptive sync already built in so it would technically be FREE

The technology is free and open. The added cost comes from the need of more advanced hardware in the monitor to support variable refreshes. This will add maybe a 1/4th the cost gsync would.