Dear experts
For the love of God, please do some googling before tweeting?
Pixel C is the tablet that will have those updates and folding to this single OS. If you look closely at Google remarks about this device, updates for it will come directly from Google *EVERY 6 WEEKS!*, just like Chrome OS devices get.
People, the new Android version is not even ready yet, and yes, i'm pretty sure that Google will change their update policy regarding those devices who will have this new "merged" Android version, It will *NOT* be like today that you have to wait weeks or months for a damn update, you'll get it directly from Google, just like Chromebooks gets them, so any security issue will be dealt quite fast.