Android's L release beta isn't out until tomorrow, but there are a few devices here at Google I/O that just happen to be running the new OS. The demo units aren't finished, but what's here gives us a good look at what the future of Android looks like.

The general theme of the interface is cards, cards, and more cards. The most immediately noticeable change is the new system bar, which uses triangle, circle, and square buttons. They work exactly the same as back, home, and recent—they just look different.

On stage, Google demoed a redesigned Gmail, but all of the devices we looked at had the current version of Gmail.