I noticed that they seem to be promoting a lot of "nearly sold out" tickets for weeks now, so I decided to take a look. Seems like there are a LOT of seats left in the O2. They've nearly sold-out the floor, but the first level ring still has a lot of availability, and the upper ring has not even been opened. Out of curiosity, I checked a few other venues, and found mostly the same issue - floors are gone, upper decks are closed or 50%ish (from a limited spot check).
Makes me wonder... maybe MP back isn't enough to have people running out to see the band a third year in a row. For me, I'm sure I'll go, but also I kinda just can't help but think... "how about some music, fellas?" I feel I am really lacking that to take my excitement to the next level.