Welcome aboard. I doubt the '15 will be any different to the '14 so the only advantage in waiting would be to see if you can get one off the floor for a bit cheaper - a '14 that is. By the way, Triumph bags for the Roadster are great but they're not quick release so you'll need to either look into some other type of bag or something like EZ brackets. There is a pretty simple mod that makes the Triumph bags quickish to get off; just ask at the time and well tell you.