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I just found this in the Insider's feedback. If you hit Ctrl T in the Store it will switch to a dark theme! Sadly, it doesn't seem to do this on any other apps.
The registry hack from a few builds back that gave us a more global dark theme has been disabled. Instead of fixing the two minor display issues from that they just disabled :(.
It seems you have to hit it every time you relaunch the Store. I guess they are testing it out. But it looks soooo much better.
Seems we are going to be screwed out of a dark theme at RTM. My hope is they are saving theming for a future revision. But as a developer, it seems easier to me to just start with system colors from the get go rather that make something and then have to go back and fix it. My real world experience anyway.