Google rolled out updates recently for its Play Books, Movies & TV, and Music apps — as well as a redesigned Play Store — all featuring Material Design. Lollipop is also on its way for Nexus devices, and tons of manufacturers have already promised Android 5.0 for their flagships.
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As of the latest update, you can now get two new material themes for your Google Keyboard; just go to Settings > Language and Input > Google Keyboard > Appearance — from there, you can choose from Material Light and Material Dark. They both look great, and it seems that its a lot easier to type with. Try it out for yourself.