While no recall, there is a service bulletin out about this issue.
I have an '11 Softail Dlx and I think they forgot to check at the 1000mi service. I took mine in at 3000mi, for a $50 oil change special, and they found all my rear spokes to be loose. My fronts are fine. Coming from a sportbike background I'm big into cornering and never noticed any handling issues. Maybe I'm just too smooth in my transitioning, eh?
Had to go back in again after a few hundred more miles and have a couple retightened. I'm having them do it so it can be kept track of. They had even mentioned that if it kept up or was too bad they might just order a new wheel.
Oh, and on a side note, no spoke issues on my '07 KLR with 14,000mi including going over the Top of the World Hwy a dozen times.
Good luck, Mark H.