I'm pretty positive 4s's still comes with 5.0.1 (the latest) or 5.0 (still works with jailbreak too)
Just bought my sis a 4s on the 12th and came with 5.0.1 and had to jailbreak it. She wasn't too convince wit the idea or my demonstration of my jb 4s.
But now she really digs the end result of her newly jb phone (customization, and tweaks)