How about a profile to control wifi lighting. Like it says I have my movie room with my lights on my network. Make a profile so when I press play it automatically dims my lights. If I press pause or stop in sets them back to default.
This feature would work best as a plugin rather than a core feature.
With so many "smart bulbs" on the market already and the price falling down to 20-30$ per multicolored one, it's all about implementing a plugin for their API. Too few of them have full API support though.
Coming soon (or not so soon)