Show dates: http://www.u2start.com/shows/catalogue/#tours%5B%5D=17
Comes from an interview with Bono in Rolling Stone:
Then the plan is to do the Songs of Experience tour with the same staging?
Yeah, the Experience and Innocence tour. It'll invert a lot of things, but it's got the same basics. We've got some incredible staging ideas, but it's basically the same language as the last tour.
See above, looks like the I+E stage with some adaptations.
Arenas or stadiums?
Adam confirmed in June the tour will be indoors:
The Songs of Experience tour will be an indoor tour, as it "not something that would work outdoors".
Latest tour rumours
Another rumour: U2 scheduled to play the Italian city of Bologna in early September, in the Unipol Arena. #U2eiTour— U2start.com (@U2start) December 2, 2017
European dates confirmed on Jan 16th 2018
2018-08-31 - Berlin
2018-09-04 - Cologne
2018-09-08 - Paris
2018-09-09 - Paris
2018-09-16 - Lisbon
2018-09-20 - Madrid
2018-09-29 - Copenhagen
2018-10-03 - Hamburg
2018-10-07 - Amsterdam
2018-10-11 - Milan
2018-10-12 - Milan
2018-10-19 - Manchester
2018-10-23 - London