This is the graphic I found. I would think that the risk premium would be higher in the future, at least that is how the chart looks to me. It doesn't seem to match your definition, but I don't know a thing about the futures market. Hopefully, some FReeper will have the pity to tell us. ;-]
Looks to me that the graph is labeled backwards compared to what I’ve found through trivial research. Given the current state of the oil futures market, one might consider buying ahead (as I’ve done for my personal consumption rather than pure speculation).