Nvidia just announced G-Sync, which is a combination Software, Graphics hardware and display hardware working together to get variable framerate displays.

http://www.anandtech.com/show/7436/nvidias-gsync-attempting-to-revolutionize-gaming-via-smoothness

Basically, at any time, the monitor can have it's scan rate modified. This is aimed to eleviate tearing, stutters and lag for videogames, but for cinema this could be great too. Imagine native 24, 25, 48, 50, 60 framerate options for various video sources, or for movies that want to try to do a variable framerate based on content/intent, that could be supported too.

Currently, this is going to be limited to Nvidia kepler hardware, and specific monitors that have the Nvidia scaler in it (but apparently some already existing monitors can have the hardware integrated DIY). I could see this being a big deal, and hopefully supported, or being a new standard for displays.