AMD might have originally thought that dynamic refresh rates were not worth adding to their machines but they did develop FreeSync quite a while ago and now that G-Sync is available they've changed their minds.  Even better for the consumer is the way that they went about releasing it; not as proprietary hardware which is only compatible with certain monitors but as an update to the DisplayPort standard which does not require any extra hardware.  We do still have a while to wait before these monitors hit the shelves, the display scaler and control chips manufactures will have to incorporate the new standard into their designs but once they do they should be functional on both NVIDIA and AMD as long as you are connecting with DisplayPort.  Read more about the process on The Tech Report.

Also, you can read the official VESA press release.

"PC gaming animation may soon become more fluid than ever, thanks to a development just announced by the folks at the VESA display standards organization. VESA has officially added a feature called Adaptive Sync to the DisplayPort 1.2a specification, which means that a G-Sync-style adaptive refresh mechanism could be built into nearly every new desktop monitor in the coming months and years."

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