I'm not expecting an "invasion" type force or a long term commitment of the military in the area after-the-fact. One of the first things Bush did after being sworn in was to fund the Iraqi opposition. Foxnews did an interview of one of those guys in London who said they are much better prepared than the Northern Alliance ever was in Afghanistan and that whole units in the Iraqi military are ready to change sides as soon as the word is given.
I look for something huge, unexpected and overwhelming. I believe this has been the plan all along, but they had to wait for the medical community to catch up with the WMD threat.
In other words, what has slowed this operation down and delayed the announcement of the biggest nation state backing al Queda and last year's anthrax attacks --- was the need to get the necessary Cipro, smallpox vaccine, emergency response, etc. in place to meet the likely counter-WMD attack. Now the US, Britain and Israel are much better prepared and thus, IMHO, it could happen any time.
Just my two cents...