Are you looking for the Revell name?, or just the kits that they used to produce?
The Rivarossi cars will probobly be a long time before the next run, depending on how soon Hornby decides to make another run. In either case, if you want Revell, or Rivarossi, and not the next generation, you will have to scour the "shows" to try to find the old kits.
Pete