I think they'll more likely play really large arenas, like they have the last couple of times they've come over. I saw them at Alexandria Palace, which was great, 10,000 or so there, and had tickets for the O2 (f***ing snow)...as HT said once before, they are a band that suits the large arena - as long as you get standing tickets!
Who knows, they might even come here and make the Centre seem acceptable!
They have just been announced as headlining the two Primavera festivals in 2014. I think you will see them headlining a number of festivals over the summer. That said I think the will stick to arenas when touring themselves (as Arcade Fire) and I think they are a great arena band; I loved their show at the 02 on The Suburbs tour.