Considering the fact that the European and North American legs of the tour are at the beginning of the year, I'd imagine that there's still plenty of time for them to do another leg in each region, besides South America, Asia and Oceania before the end of the year. And I'd expect that the setlist will stay the same, even if they play some of the same cities as on these first 2 legs of the tour, considering that they didn't change the setlist at all in 2014, aside from shortening it and adding PMU for some of the festival shows they did.
As for next year, maybe they'll do another tour like they did last year, but maybe they'll take the whole year off and just work on the followup of TA.