Voyager summed it up perfectley. There is no official forcast sorry. Other than that new pools of tracks will be added when existing pools get too large. However the predicament we face in tm2 is the staggered release on enviroments. The existing pools would be useless if they remain as canyon only, so the options are retire the pool, or retire some of the tracks and replace them with ones of the new enviro. The possiblity also remains we may lift the restriction on uploading them to mx but not retire them. It is likely we will not be forced to make a decision until the next enviro is released.