I had ordered a Bushmaster Carbon 15 .22LR Upper in mid-October 2005.
I received an email shortly thereafter that they would be going "back into production in mid to late November" and would start shipping at that time.
I called today (January) to check on the status of my order.
They told me that they were making some changes to address reliability related to:
a) the magazines
b) the bolt
c) maybe some other stuff
This required them to rework the molds for the magazine insert to hold the new magazine.
They were having some problems getting the new molds correct, etc, etc.
They wanted to get everything just right, etc, etc.
Bottom line, there is no ETA at this time.
They said that it might be 4 weeks, or it could just as easily be 8 weeks or 12 weeks.
No way of telling.
I, for one, would be happy with a new magazine design as some others had indicated problems with the Remington 597 based design they were using.
Provided, of course, that the new design is actually better.