Yup. Most of these will be gone in 18 months. Biss definitely, Tross very very likely, still think the Maup and Mac will sign new contracts. As for the older players there is no hurry to make a decision, not like a lot of giant teams will be competing for Duffy, Veltman and Lallana.
Guess it could happen but wouldnt expect it until the transfer window closes. Liverpool, Arsenal and Man City are all possibly looking for a midfielder and I doubt Biss will commit to staying until the chance of a big move is (temporarily) gone.