If I was on a GSM carrier I'd trade in both my old HTC phones in a second for this.
The HTC One is being offered at over 180 carriers, most of them GSM. Basically unless you're on Verizon you can likely find the HTC One on your carrier. Who are you with?
You guessed right, Verizon.
The black version is more understated, yes, but it's got this gorgeous matte finish that looks really amazing. You can't go wrong with either. :-)
Probably trading in my Evo 3D for the white version. I completely agree about the black not popping, but I'll reserve my final judgement for when I see them in person, assuming Sprint offers both.
btw is March 15 pretty much a confirmed rumor for release?
Nothing officially confirmed yet. There are rumors of delays in production due to limited supplies of the Ultrapixel camera.