The published system specs from the 11/13 announcement "subject to change (of course)" are about halfway down the page:
http://www.red.com/epic_scarlet/
11+ stops for the Mysterium-X powered Scarlets and Epics, 13+ stops for the Monstro powered varieties.
This would be an improvement over the Red One's already impressive 10+ stops dynamic range. Keep in mind, the Red One has a sensor natively rated at about 320ISO, if I remember correctly. It wouldn't surprise me if the new cameras are natively rated at 400, and easily pushed to 800 or even more without objectionable grain - oops, I mean noise.
So, yeah - I don't think shooting in low light with a Scarlet or Epic will be a problem. But, in realty, who knows yet. Maybe a clearer picture tomorrow...
