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Game support would be poor at this time point, and I highly doubt there would be a bunch of new games supporting metal.
 
I heard Epic Zen Garden supports metal. But I still don't understand exactly what it does

I think most games designed specifically for 5s, 6 and 6+ support metal. And soon in iOS 9 the OS will use Metal to increase its performance. It's just a more efficient way of utilizing the graphics chip. Less overhead.
 
Don't forget that iOS 9 will to take advantage of Metal, so not just App Store apps anymore. According to Apple, this should improve OS smoothness and performance.
 
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