According to our source, the AMD Summit Ridge CPUs based on Zen will be disclosed during November - Dicember 2016, but the availability on a massive scale will be possible only during 1Q17.
This timing will be honored only if the testing of the chip will proceed without problems. On the contrary, Zen could be delayed by one or two months.
About the Bristol Bridge APU, based on Excavator core, the rumors say it may be able to debut earlier than scheduled, in March or April instead of May or June.