trouble,
They are slowly but surely getting around to it. The new L1, KL-1 and KL-3 have the new SAIC-designed TIR optics. The new KL-3 is in the second generation of TIR design for better spill (via concentric rings ground into the optic as I understand). The new K2 Kroma and Kroma Mil-Spec versions are also SAIC-designed TIR optics and I understand that these are second-generation designs also. Surefire is very careful and thorough before they release a product to the public, and the TIR optics now emerging have been in the oven for quite a while. Expect to see many more products with these optics in the future.
I am not qualified to comment on chesterqw's assertion above, but if true, Surefire has a lot of Luxeon V designs that would have to be re-thought. Part of the problem is: Do we want them?? A Luxeon V is a wonderful flood-machine. The L2, L4, L5, L6, and U2s are wonderful for what they were designed to do. If they ain't broke, let's not fix 'um. None of the lights listed above need to be "fixed". We already have the new KL-3 "option" for the KL-5 head, which may have been needed since the U2 supersedes it. But, I'm not sure anything else above would benefit by TIR replacement. The new E2L is an "option" for the L4, not a replacement. The new L1 is now a TIR and if you want spill, YOU MUST USE an F04. I'm not sure that this additional requirement (that increases the size of the light) is an improvement. It gives you a "throw" capability that was previously lacking but at the expense of everything else. Some like it, some don't. An optional head replacement for flood or throw would have been the answer. Then everybody would have bought one as an option. Now, a choice involves $135.00. Same problem with the E1L and E2L. If you are one of those that prefer throw at the expense of all else, this is wonderful. If not, this is a disaster. Surefire has responded to this problem (to a limited degree) with the in-line change to the KL-3, allowing more spill by grinding concentric rings into the TIR optics. I also understand that the new K2 models also have a different (or better?) TIR design that allows more spill. SOMEWHERE ALONE THE LINE WE EITHER HAVE TO STRIKE AN INTELLIGENT BALANCE OR WE HAVE TO GIVE THE CONSUMER AN OPTION!
In short, we will always need the power/flood option in the mix for specific need or personal preference. YMHO. Thinking out loud.
Hope this helps.