I'm actually considering this, or the OP3 as a next phone. Really like the unibody design, though I suppose it'l need a skin/case so it doesn't slip. The finger scanner being on the back is nice, so is the expandable storage option. Also hurray for 64GB being standard screw 16GB. Lastly is that dedicated audio they got going seems pretty sweet, would love to see how it handles the higher end cans. Though I'd like to see if they'll unlock the bootloader.
*Also low light performance seems sketchy, which is a shame. And a few software annoyances I'd like them to iron out.