Ford put out a press release about a month or so ago. Both the F150 and the Mustang are coming out on new platforms. SVT will work with these new vehicles and have product offerings for 2006.
SVT is also dropping the Focus from it's lineup. I'm pretty sure Ford is dropping the Focus also and replacing it with some sort of SUV thingie. It sounds like the replacement is not a vehicle that SVT would really want to play with.