I've been watching out the UA2 and UB2 (optimus and invictus) developments from the start. I think I also started one of the first (though not the first
) threads on these trying to find out as much as possible.
I will continue to watch and especially focus on (he, he!) reviews of it once it comes out. It will be interesting to see how this focusability feature works. Personally I need to be convinced it is a valuable feature, since I just put in diffusers on flashlights with throw if I want to change the beam characteristic. But it'll certainly be interesting to see what Surefire does with it.
As to buying one...almost surely not. The price is very high, and the benefits do not add up to it. The 200 lumens sounded great when the UA2 specs were first heard about, but now its ho-hum. (I count 4 flashlights in my collection already that match or surpass that--no, make that 5).
If technically things work out, it will still be great, as the features will migrate down the food chain to cheaper flashlights. At that point, it may be worth getting them (together with yet more upgraded LEDs, better runtime...the usual).