FCC staff has further refined its proposed inventory and structure of its planned 2.5 GHz auction (Auction 108), which has yet to be scheduled. A revised list of Auction 108 inventory has been released adding 189 licenses and removing 370 licenses. Also, a multiple-round clock auction format is being considered using three spectrum blocks (of 49.5, 50.5, & 17.5 megahertz, respectively) licensed on a county basis. In light of the Auction 108 inventory revisions, comments on these recent updates are being sought by March 4.