Most car models are on a 6 year cycle with a facelift after 3 and a minor facelift and equipment upgrade at 5 to keep the model still selling. Keep an eye out for a special edition in the last year ("Edge" or "Sport" for the Corolla) this will usually tell you that a new model is coming out soon, although they have been known to do the special editions just to increase sales too. I would expect a new model to be released 2013 for the Corolla, I think the ZRE was available from April 2007? These are just my observations so don't go making large bets with people based on them....