The current setlist isn't the best possible for such a tour (despite the SIT songs), a tour like Legacy is perfect for that, but we know Maiden aren't worried about that. If they are planning a big stadium tour next year in Europe, I think it could be a Hits tour (50 years) or to heavily change the current one, which would be very unexpected.
If it's a different tour, I don't know (even about these two). If it's the same - Alexander, Hell On Earth, Writing, Stranger and CSIT (maybe) should be locked.