Printing resolution seems to be 0.5mm to 2mm minimum detail, depending on material. Colors are cream, white, transparent (translucent yellowish, from the looks of it), and bright white. They all have various properties (one bends well, some are weaker, etc).
Maximum size varies from 20x25x33cm to 35x40x40cm, depending on the material as well. Prices range from $1.87 to $2.89 per cubic centimeter.
I'm not affiliated, just a beta user. I got my invite the same day(?) I signed up for one, so if you're interested, go sign up. I did look for anything saying that that information might be proprietary, but I couldn't find anything, other than the warning that those prices may be low for the beta. (And that the beta includes no shipping/handling fees, I believe.) Sorry if I shouldn't share!