I don't work for Virgin, however I have been trying to follow Virgin's entrance into the US market as much as possible. I am doubtful that positions in the new organization would go to other's than US citizens. Simply because Virgin is limited to owning 25% of the company and the pilots would most likely have to be FAA certified to fly N-registered aircraft. Of course, UAL did have a pilot base briefly in the UK, however that was according to terms agreed to by the two governments.
How did it work when Blue was started?