The magical link road that was to be the airports saviour, still hasn't commenced, almost a year after construction was meant to begin. There is no serious doubt whether it will actually happen at all.
TimmyW, the link road is due to start when the White Rose Way improvements have completed - which is almost complete, but not quite. The contract for the link road was signed in October 2012, and the council's website states that construction will start in early 2013.
New signs were put up on White Rose Way in the last week. Approaching the M18 Junction 3 from Doncaster, there is sign just before the junction roundabout to indicate the directions on the roundabout. The sign has an arrow for straight on (the new FARRRS road), so I think you safely say it is still due to be built.
I'm not sure where you get your information from, but there are adverts running on Capital FM for Robin Hood Airport at the moment, so they clearly are spending money on advertising.