Just received my GG collector's club newsletter and saw this link
Apparently, Gentle Giant is importing an unspecified quantity of the Tomy mini-helmets from Japan, and they'll be available in June.
Personally, I think this is an indirect answer to our question: "When is the Armory Collection going to be released?" I guess they're not anymore. It wouldn't make sense to import a product that's so similar to one they've been developing.
It's a shame too because I suspect Gentle Giant's versions would be made of a higher quality material. Now, I'm just basing this opinion on pictures alone, but the Tomy versions do seem rather cheap compared to GG products.