If memory serves, Revell/Monogram announced it in a press release mentioned in Fine Scale Modeler a while back. I've been waiting with bated breath ever since.
With regard to your collection in a Minuteman, nearly all of what the U.S. has issued in the last 15 years is just postage (there are notable exceptions). I sure wouldn't waste funds on updating the Minuteman! It'd be mighty expensive to find all those supplements, most of which are out of print.
I really should try redoing my avatar, since that particular stamp is in my collection. It's so small because a lot of other forums need them little.