Info re: Suite Seat Assignment

I called Virgin today to request UC seat assignment for JFK-LHR flights in June. My wife and I chose 7a and 7c for the inbound and outbound flight. Currently, our flights are not equipped with suites, but they might be by June. The Virgin rep told me that if the plane is equipped with suites, our seat assignment will automatically change to 7a and 8a. She said that I did not have to do anything else. Has anyone else inquired about how seat assignments are converted from regular UC seats to suites? I was wondering if Virgin has issued a policy on the matter.