For a developer Google is the pinnacle of technology and innovation. Google is kind enough (since they only do good^^) to share their knowledge once a year to a broader audience through Google IO.
This year's event is currently under way and there are basically two links you'll need to stay on top of things.
Those two links should give you all the information you need to follow Google IO.
Interesting in this year's event is the showcase of material design and the new Android and the direction Android is heading towards.