I don't understand why some of you think it's strange that they are rehearsing.
Music is their job, it's their profession. As a professional musician rehearsals are the most important part.
It was rather strange that up until 2005 Jon bragged about not rehearsing at all. 1) I never believed him because especially on that level you have to rehearse to put on a great show 2) With Jon being that workaholic-perfectionist, such a behaviour would have been more than nonprofessional.
So using the time for rehearsals while not on tour is the best they can do. No matter when a new tour will start.