No, you're not seeing double. This is indeed CM11 M11, or to be more verbose, the 11th milestone release for CyanogenMod version 11. This release is sort of less spectacular than previous ones and probably rightly so. It hints that most of the development is now focused more on fine tuning than introducing big, invasive, and potentially disruptive features. It could also be the calm before the storm when Android L is released and all development hell breaks loose.