What I have understood Chrome OS won't be there anymore but will be replaced with Android. Not 100 % sure though...
The new Desktop OS will be called Android and will be running on PC hardware. I guess Google wants to challenge Microsoft and it's operating systems Windows 7/8.1 and 10.
You have to wait until 2017. However, it's not that far away, is it!
Me and my Chromebook really look forward to see the new Android!
Edit: Android and Chrome OS might NOT merge? Not sure who to believe anymore.
Android 5 on Nexus 7 (2012) wifi
Chrome OS desktop