Hi BKR;
All this information was disseminated at the 2017 Elevate conference in particular, in my technical part of the keynote address. You can review my PB2017R2 keynote and other recorded sessions ... click here.
Note that PB2017R2 is still on target for December 31, 2017 to be released from Engineering. From there, we expect about two weeks before the public download is made available.
HTH
Regards .. Chris
Appeon: Director, Developer Relations