I dug this up from the "United RFP???" thread

"The RFP was received on May 9th and the bid is due on May 21st .
It is a short-term RFP for 10 Q400s, 10 Dash-8s, 20 50-seat jets, and 20 70-seat jets.
Bids can be for any combination of those aircraft."

I don't know if that's the one, but that was the last i heard of it.

(Coincidentally almost identical to Mesa's fleet flown for United.....)