I'm curious as to how they'll deal with depletion of their 256 bit UUIDs and/or spoofing or anything else. We can know is that Google (and others) will have a way that works across IP addresses that will provide a fairly unique way of identifying you no matter what. Presumably some browsers will let you change it or have it different in privacy mode or whatever, but like with Don't Track we'll can almost guarentee that even if there is a standard some other company like Microsoft will implement it just differently enough to make a lot of it pointless... other than the connection speed I guess.
People are already gungho about this, some thinking that it's a total replacement for the TCP stack which is utterly stupid. I first read about this in mid 2017 and noticed it seemed to be sort of a spin on MinimaLT which was specified to deal with mobile IP (as in protocol, not address) issues.