On Trackside last night, Marc Koretzky (COO / President of the Commercial Division) said that they expect to announce 2 races for the 2013 schedule this spring. This would make some sense in helping to reach RB's goal of having 19 races in 2013 (mentioned during his interview last week on Trackside). In addition, Koretzky said they are planning to announce the full schedule much earlier than they did for 2012 (I think I've heard September mentioned by a couple people).
So what 2 races are most likely to be announced, assuming they are new/returning to the schedule? I would think they would come from a group including: Houston, Ft. Laurderdale, Vegas (Street), Phoenix, Richmond, Chicago, Road America, Watkins Glen.