Will the new 2015 Ford Mustang have the steering wheel on the right?

Because Corvette Stingray sold in the UK comes on the left so I was wondering if it's the same for the Mustang

Considering that the new Mustang is going more global, there may be a chance that it will.

Yes, Ford is taking the 2015 mustang global so they are going to be selling it in the UK where it will have RHD

Yes the European models will.