Last year it was on C-band on one of the atlantic satellites. I would not count on it being on Ku. In fact I dont ever remember it being on Ku as long as I have been doing this (2007)
I do not know is Speed has the rights for this year or not. I do know they have been getting less and less coverage as the years go by, it used to be a big deal. But then road race fans in the US are a minority, Taxicabs seem to be the 'IN' motorsport in the US for the foreseeable future.