Formula 1 set to add second US race on streets of New Jersey from 2013 - F1 news - AUTOSPORT.com

Formula 1 is set to have two grands prix in the United States from 2013, with plans for a race around the streets of New Jersey expected to be confirmed as early as next week

........

It is understood that the New Jersey GP will take place in June 2013, so it can be a back-to-back race with Canada, which will then leave the Austin event to keep its place at the tail end of the schedule to tie up with the Brazilian Grand Prix
The return of the Mexican GP should leave the Americas with almost a quarter of the calender.