I have spoken to my local Ford dealer and he says the price for the ST and Zetec S will be with the Dealers in the next 2 to 3 weeks,I hope there is some discount for us Fiesta owners !!
RS would be around 15k retail I reckon, 16k would be just too much. This is why it might well not get made as it would take a lot more development work than the ST and would have to be considerably better than the Clio 182 to justify being a couple of g's more.
RS price is entirely dependant on spec. This car may end up being a competitor to the Clio V6 which retails at £27k ish. So I wouldn't like to guess really.