Just speculating but putting 1+1 together...(1) SFO T3 pier E is reopening at the end of this month but there will not be a UC there. However, (+1) there used to be an Admirals Club in this pier before AA relocated which suggests (=2) this may be the location of the next Centurion club since rumours put it in UA territory.
http://www.businesstravelerusa.com/n...fran-on-united