I'm assuming the PS i use will make up for the new fuel. Plus the current diesel will still be available until 12/1/2010 and probably cheaper than the ULSD at first. Using ULSD in 06 and earlier trucks may loosen some of the deposits in the fuel system so check the filters often.
Edit: I just read that additives to increase lubricity and inhibit corrosion will most likely be added to ULSD prior to retail sale. Here's the link. ABC's of ULSD