Google translate Spanish press:
Apparently, this is a tour in which Iron Maiden would be accompanied by Judas Priest and Anthrax, with Ghost joining the tour on select dates.
After talking with some Spanish promoters, these have flatly rejected that such a tour will take place. At the outset, Judas Priest and Iron Maiden are not going to spin together in the short, medium or long term. Secondly because the Camp Nou, with capacity for 90,000 people in concert format, far exceeds the capacity of summoning all these bands added. Even U2, on their successful memorial tour of "The Joshua Tree" has opted for the Estadi Olimpic, seating up to 65,000 people in concert format. Iron Maiden, in its last concert in Barcelona, gathered 15,000 people in the Palau Sant Jordi. At Sonisphere 2013, along with many other heavyweight bands, it gathered just over 22,000. Given that it was a unique date, such as when they have come to festivals like Sonisphere 2011 or similar, where they have gathered 30,000 people surrounded by countless bands, chances are that the band play at the Camp Nou are scarce.
Can Iron Maiden spin in 2018? It is possible that they do a round of European festivals. So will Judas Priest, but in no case will they spin together.
+Camp Nou is one of the hardest and most expensive stadiums to rent for concerts