i reckon, more den 4k, less than 5k. the pricing must be placed below 1dmk3, and way higher than 40D or even the 50D coming next year.
i am also sure canon will not want to place their product in a way that its killing off either the 1dmk3 or 1dsmk3, well..... hahaha... i guess if u can wait. it could be well worth the wait. but otherwise. i felt that 5D itself is already itself a great camera. although paying something close to 3k for a 2-3year old tech sounds pretty dumb for someone who would go for the latest and greatest, but afterall its just a tool.
5D is very much a capable camera of producing seriously good pictures... so.. its a great camera. replacement of not. its already great. heh....