In HTC parlance, the "Neon" codename denotes a device of the Touch Dual form factor -- original Touch styling plus a slider keypad, a drill we all know by now. This particular form factor seems to be a pretty popular one, too, considering the sheer number of variants HTC's turned out; at this point, we have one for Europe, one for North America, and one for Japan, and a new FCC filing suggests that there's still at least one more trick in that pony. The so-called NEON400 doesn't give much away from the ID label document that we see here, but test reports indicate that it's sporting CDMA 850 / 1900 -- just right for launching on Sprint, Verizon, Alltel -- you get the idea -- and obviously, we'll see EV-DO in there as well. Against the Touch Diamond, the Dual is starting to look just a little dated, but it gets that all-important keypad that the Diamond lacks -- so even networks that end up launching the Diamond can realistically make room for this one in the lineup when it's announced. By someone other than the FCC, that is.