I have this one theory...
This could be DT's most ambitious album in a long while.
Many people say that they always say the same,that it's "different" or "special" or "unique", etc. But maybe this time they actually mean it.
It can't be that they say that so much this time, while at the same time remaining so silent about it. During the short interview, they actually stated that the album process was interrupted by the tour, which means that it's not complete.
Alright, consider that they got the base stuff, some organized and planned, yet they still got enough things to do to keep them "very busy" at hotel rooms and that. Which means that they are using this tour to see how the audience reacts to different moments of their careers and see what they can come up with, maybe indeed something unique we've not seen so far.
This tour is teaching them more about us, the fans, and it was to be inspiring, absolutely.
Dunno, the fact that it's taking so long, that there's no single and that they decided to get into a festival tour at this point, means that they're definitely doing something big.