That's the next album which is partly done. After both albums are released and the tour is over who knows? I think they can still do another album after that but it's hard to predict the demand or landscape for them. Even Bono said in the last tour that they don't know if they will be able to do it again. If these two albums are successful (along with the tour) I still think they will do at least one more. If it all tanks I don't see why they would. If the demand is there and there are no health problems that will be the only thing to keep them going. They also need constant source of material.
A lot of the reasons listed in articles about REM was that they were getting less and less sales and they could see record companies wanting to tell them what to do. They also looked at their catalog (which is impressive) and felt they covered enough territory.
Though these iTunes stats look promising.