The TDP/power consumption is by far the most surprising thing about Ryzen to me. You'd expect it to do well in heavily threaded applications just from a core count perspective, and it's not that surprising that they've done some catching up to Intel in IPC, given how slowly Intel's chips have advanced on that front in the past few years. Actually beating Intel on power consumption (if that is indeed the case) is straight-up crazy, though, as Intel seem to have been focussing the bulk of their R&D on reducing power draw for over 5 years now, and they've still got an effective manufacturing node advantage over AMD.
It bodes very well for AMD's laptop business, which is near non-existent outside of the entry-most of entry-levels due to how poorly they've been competing with Intel on perf/W, but the potential of affordable quad-core Zen APUs with decent integrated graphics and genuinely good performance per Watt could shake up the laptop market quite a bit.
The mention of "Ryzen Mobile" for this year on one of AMD's slides is also very interesting in that regard, as it suggests that they're actually going to release laptop parts based on the Summit Ridge die (i.e. up to 8C/16T with no IGP). The 65W TDP of the 1700, combined with the low reported real-world power consumption of the 1700X above, would mean this could be the first big leap in mobile workstation performance for the best part of a decade. Granted, any laptop featuring these would need a dedicated GPU, but AMD's 35W Polaris models are quite power efficient, and at the price point an 8C/16T laptop would likely go for a dedicated GPU would be expected, anyway.
I don't expect Apple to move away from Intel any time soon, but if they introduced new MBPs with 8C/16T Ryzen CPUs this year I might finally have a reason to upgrade from my old 2720QM-powered 2011 model.