Yeah it's standing for most gigs actually, been to quite a few down there.

It's basically up to the band/promoters as far as i can tell; & there were actually quite a few reasonable explanations as to why the opening show was seated. (I think one of them was something along the lines of the O2 didnt want jovi fans queing up all day outside their new venue + other reasons.)

Saw Snow Patrol there 4 days after that one, and it was all standing.

Would be absolutely gutted if it was all seated this year.