But a source maintains, The Ranbir-Imtiaz film is very much on. It will roll in September 2013. u00a0The source adds, The trio are keen on working together. Sajid had signed Imtiaz a long time back and Ranbir has worked with Sajid in Anjaana Anjaani. But as Ranbirs dates were an issue, it was decided that the film would roll later. In the meantime, Imtiaz will direct another film for Sajid.