The programme for the next Summer School will be available late January. When the programme is published and registration opens, a message will be sent to everyone on the mailing list (persons who have registered and participants in former Summer Schools)
Although the programme varies from year to year, most courses are usually repeated every second or third year. An exception is the Structural Equations Modelling workshops running every year, and recently a workshop or two that were in high demand. This of course depend on the availability of instructors
A look at the previous Summer School programmes will give you a general idea.