I bought 2 of these today. Looks like the anticipated K2's right? But actually they are the "DEF 8K" models which I think were made for the military or something. Both of them come with the main white LED and an outer ring of 2 LED colors. I bought one each of the A and B version, the only difference being the color of the outer LEDs. The A version has RED and BLUE whereas the B version has RED and GREEN. The dealer told me that it was part of a limited batch they received and it has the PK logo laser engraved onto the side. The colors are selected by the ring just behind the head (just like the U2). The tailcap is a 2 stage clickie which adjusts the 2 stage brightness of the main white led. I also saw a "DEF 5K" version, the difference is the brightness of the main led and the inability to turn on the outer leds independantly of the main led. The very interesting thing is that there is no serial number on the main body like there is on all other surefires I know of.