Don't forget the US prices are usually exclusive of tax which is added at checkout.
Plus if history is anything to go by, the launch price often falls a chunk within 3 months. One of the few exceptions was the E-M5 and that was because of its near-cult status creating a back-order, though it seems as though the A7RII is heading the same way from all the chatter and hype at the moment.
For reference, the 5DIII is £2,300. In US the prices are 2,600 (5D3) and 3,200 (A7RII) so the differential is less (BH prices) in UK than US which is interesting.