I have a Nexus 5 running on Android 4.4.4 Kitkat, and the mm-qcamera-daemon problem appeared today for the first time (I don't have the usual culprits like Snapchat or Skype).
Does Android L Developer Preview fix this issue?
Android Enthusiasts Stack Exchange is a question and answer site for enthusiasts and power users of the Android operating system. It only takes a minute to sign up.Sign up to join this community
Unfortunately I was still getting this issue (seems to come and go) under android L, so to answer your question, no, it's not fixed.
See https://code.google.com/p/android/issues/detail?id=70755 for others who are reporting the issue still exists.