What do you think of AMD Ryzen?

Answer: Wait for official non-party benchmarks in Q1 2017. There is no conclusion available until then.

Check comments for results and interesting info here:
https://www.reddit.com/r/Amd/comments/5i61m3/amd_zen_new_horizon_event_livethread/

When we see some real unbiased 3rd party benchmarks of Ryzen vs Kaby Lake (e.g., Anand, Tom, HotHarware, etc...), we will decide. They are both slated for Q1, 2017, so that's when we will know for sure.

And prices, models etc. aren't really known yet so.. We know nothing.