I often see it argued on fan forums about whether the current state of the HeroClix rules is HeroClix 2.6 or HeroClix 1.17 or HeroClix 14.0. I like that there's no clear answer; it means that we made those needed transitions from one state of the HeroClix rule set to another as smooth as possible, and that on the whole players feel it's one large evolving continuum rather than a line with a big compatibility break in it.
Seth Johnson, HeroClix World Interview (2009)