Today, 02/24/09, I received an E-mail from Milwaukee Electric Tool Corp. being that I'm a member of their Heavy Duty Club. It shows what they say are 2 new tools in their newish "M18" class of cordless tools. They are a 3/8" and a 1/2" square drive impact wrench.
Here is some info on each of them.
3/8" drive model 2651-22 and 1/2" drive model 2652-22
Special note: I bet these have been out for some time. It seems the last to find out about new Milwaukee products are members of their Heavy Duty Club and it's been that way for years. GRRRRRR ___ In addition these do not come cheap. For the $$$, I can get a very good air powered impact wrench and have nice $$$ left over for good quality impact sockets. The Ingersol-Rand model IR213C comes to mind. The model IR231G looks much the same but is a POC beside the C version.