My 2011 does this too. It has for some time. I notice it mostly around 2500 RPM or so, when I hold the throttle steady and more in second gear. It was going on for a while, very slightly, dealer couldn't replicate it. Eventually my TPS went out and it was a nightmare (happened on day 2 of 2 1/2 weeks and 2500+ miles). I don't know that the two were related, because I still get a little mild surging at those lower RPMs. It's mostly just an annoyance.
2011 Imperial Red
Givi V46 / V35's SW Motech mounts
Skidmarx hugger Moto Werks bar riser
Mondo Motors LED Driving Lights
A little bit of road rash