Just found the new GITD Nalgene at my usual sporting goods store yesterday and... being a consummate gear junkie... I picked one up. They are BPA free, but your water still glows in the dark. :) They are rigid like the lexan variety, although their color is opaque like the polypropylene kind. They come in a green and grey color.
After charging my green one under a lamp for a couple of hours, it emitted a pleasant glow (like a mild glow-stick) for over an hour. It may have lasted longer, but I fell asleep.
A fun change of pace for my water bottle and they don't cost any more than a standard lexan one. I want to pair one up with one of Guyot Design's Firefly lids just for fun.