block D definatley appears to be seated, even gave me a row, seat number and pricing is to high for standing... If you look on ticketmaster, click on birmingham link for seated tickets (opposed to standing ticket link) it gives you 3 options in drop down box... upper tier seats, lower tier seats and floor level seating.
Have noticed on the ticketmaster seating plan there are blocks A & B where the stage would usually be if it was a normal arena set up. All I can think is there are blocks C & D opposite this on the floor before the tiered seating starts :s