This year's big announcement: an all new Cardboard. The new Cardboard is smaller to carry around but houses enough space to fit in a 6" phone. Also, the magnetic button has finally been replaced by a new button the has capacitive foam that actually touches the phone screen to 'transfer' a touch. Thus the Cardboard is compatible with all major phones -- including iPhones.
Google solved the implementation part of VR with the Cardboard. But what about making the content? Google has an answer for that too.