Doubtful. If H-D does come up with a variant of the Revolution for touring bikes, they will have to make some major changes to increase low speed torque. Heavy touring bikes and high rpm low torque motors won't sell very well. Of course, they will eventually have to convert to water cooling, but I'm quite sure it will be only when they have no other choice. They do not want to lose their traditional customers, and tradition says big air cooled V-Twin. If I had to guess, I'd say that when they do make the change they will do it with one new model and work into it gradually.