The International Pier has 3 stands that can accommodate the A380 (please correct me if I'm wrong on this). Only one has a double airbridge, but the others can be fitted with extra airbridges if and when required.
Regarding 2 Class/3Class Ops, BHX will get the 3 Class Service next (in the UK) probably before A380 ops commence and timing will be dependant on aircraft availability.