I just found out a few days ago that Bushmaster was bringing the Carbon 15 rifle and pistol out in 9mm. I e-mailed the company about other calibers coming out in the future, namely 45 ACP, and received the following reply,

"Bushmaster may be adding other pistol calibers to the line like the .45 later this year. No decision has been made yet to do so.
             Thank you,
             Jim Eden, Tech Support
             1-800-883-6229 "

www.bushmaster.com/shopping/Carbon15/az9-c15r16m4ft.asp

This may be old news, but I was not able to find anything concerning this topic via the search mode. I have not seen these being listed in wholesalers catalogs yet, but I have not actually been looking for them either.

This is the Carbon 15 receiver, and I don't know if that is bad or good. I do like the lightweight and feel of the Carbon rifles.

Quoted: "Bushmaster may be adding other pistol calibers to the line like the .45 later this year. No decision has been made yet to do so.              Thank you,              Jim Eden, Tech Support              1-800-883-6229 "

I'd like to see what they would come up with.  It will probably depend on how their 9mm series does.  
Here are a few threads on the Carbon 9mm:
www.ar15.com/forums/topic.html?b=3&f=15&t=259071

www.ar15.com/forums/topic.html?b=3&f=15&t=260325

i am hoping for hi-caps for the .22lr



dpms is taking forever for theirs