Are you expecting Zen to deliver better performance than Kaby Lake?
I don't think it's going to be faster, at best, it might match it in MT workloads but again, they will try to do so within the 95w power envelope (my guess), so unless overclocked, it's going to be okay, if pitted against KL, and won't be that cheap either. Likely going to win the perf/$ award, though. But Zen is definitely being overhyped here (and so was Haswell 3 years ago (AVX2), I remember that too). BD-E is going to be very sexy, if overclocks well and does so within 'reasonable' power consumption. That's what I am looking forward to, right now. But I am ready to disappointed and/or proved wrong. I am easy going. Question remains, if they give AM4 socket more than 8 cores/modules. Time will tell.
SKL-E, not so much. For the 16nm process, I expected better results (power consumption in particular; versus the older 22nm/3770K). When they get back FIVR, things might get exciting again.