Epson does things differently, which is why they always have a bigger jump from D65 to max power. They use a color filter that slides into place, in the less bright Theater Black modes, THX, etc. Even without the filter, you can calibrate to D65, although we don't try. When Mike does a "quick-cal" a tweaking of the brighter modes, the goal is to improve the picture as much as possible, without sacrificing too many lumens.
I'm not sure about the full story in general, with 3D color. We have no reasonable way to calibrate the color accuracy on the eyeball side of 3D glasses. Let's say, I've yet to see 3D look like a D65 calibration with 3D. Colors are usually off a little, saturation often seems too high, etc.
I haven't yet seen a 3D projector (in 3D) that I think will satisfy a person who demands a THX quality 3D accuracy and look. A small sacrifice for 3D, though for most. I watch a lot of non-movie 3D, and, like watching a football game, when I'm watching a tour of China, I can forgive some of those color flaws, and in the case of 3D - at least for now, I'm more than happy, to trade a little color accuracy for a lot of lumens.
My first impression of the Epson's THX 3D was that it was really good. But I don't think it was as good as the 2D THX mode... We shall see.