Today I spoke with an SF employee about these new X lights. I cannot reveal his name however I've known him for quite awhile and he's not a PR type but someone who has handled and played with these new lights.
The Pro X models will toggle from High to Low and the others Low to High.
The lights are 200 lumens for about 90 mins and will step down although my source didn't know for certain if it would be a 3 step decrease from say, 200 to 50 to 5 but thought that it would be very close to that.
The LED is integral to the head and cannot be removed. These lights are NOT made to be used as weapons lights for those wondering. There is no shock absorbing inside these new heads so the lights are fine for handguns but not other weapons.
The price point is one that SF is happy with given that it puts great output into people's hands for an expensive price given what the total package offers. This light is not meant to be everything to everyone but it does cover a very wide segment of the market. It reaches to upper end users while also reaching down to lower end users with a good compromise set of lights.