For 2013, Ruger is including a Picatinny rail with the Mini- 14. here is a picture of it:
I can't tell if it is an improvement or not. It looks like it could interfere with ejecting empty cases. It's not very long. To me it appears to be a non-solution to a non existing problem. But, I will admit that I haven't seen one in person. So, maybe I'm missing something. Time will tell.