The equation is simply the yield of the CTD, using the delivery px implied by the current futures px (delivery px = futures px * conversion factor).
I don't know a place that shows you the UST fwd curve (consturcting a bond fwd curve is not a trivial exercise). However, you can see the daily closing spot yields here:Quote from tradingjournals:
Where could I find the forward rate structure for US government debt (bonds/notes/etc)?
http://www.federalreserve.gov/releases/h15/update/