Well these are pretty cool, but I'm not calling them Archons. They'll probably be servants of Imix the Archomental or the Efreet or maybe both in my 4e Planescape campaign. All in all 4e's treatment of the Elemental Planes has me a bit intrigued, like the fact that they will supposedly be more accessible and useful for play though I will keep the structure of the Greet Wheel's elemental planes rather than the Elemental Chaos, though some ideas from that might be also integrated into Limbo.
This.
I like 'em well enough. Fiery humanoids with fiery empires and fiery armor is all well and good. Though the bit about the arcane forge might be a little too much magitech for some worlds, I generally enjoy the sprinkling of magitech, so it doesn't bug me much. They've got some potential.
Archons, however, they are not. Archons are crusading celestials from the Mountain of Heaven, and they haven't given me a real reason to buy into their name change. The animal-headed spirits are evocative of Egyptian deities and the like, they just need a bit more commitment to the archetype (hound archons who serve loyally beside mortal princes, for instance).
I think I like the term "Imixians." Humanoids wreathed in fire? Sound perfect for an ancient cult once dedicated to this Archoelemental that immolated themselves, and then
didn't die, due to Imix's dark blessings.
Or to make them more generic, we could call them the "Suri" or the "Sorkhi" or the "Agnites" or the "Chvarog" (going to some Indo-Iranian fire references, though Chvarog is close to Svarog, which is Slavic). Or the "Kolovrati" (from the Slavic word for the Swastika, which is associated with the sun and fire). Or the "Belenids" (from Belenus in Celtic folklore). "Flamekin" or "Cinderkin" sound pretty good, too.
Some of those names sound SERIOUSLY AWESOME, more so than "Archon," in fact. Chvarog especially....good name for a warlike race of flaming people, methinks.