Pretty sure I've read that they are going to be producing RHD cars for overseas but not 100%/
Mind you that the majority of "overseas" drives on the same side of the road as you do. Exceptions with Mustang-buyers might be UK, Australia and Japan. But everybody else in Europe needs the same cars you need.
I'm really curious to see whether the Mustang with a 4-cyl will sell here. The V6 is not for sale, and the V8 ridiculously expensive due to eco-taxes. But maybe the 4-cyl will catch on, if priced right. Coupes are not very wanted in Europe at all, hatchbacks are far more popular.