Update Cyanogenmod to latest Snapshot I am running Cyanogenmod on my Samsung Galaxy Nexus.
by the beginning of March 2014, Cyanogenmod released V11 Snapshot M4.
As far as I know, I am still running Snapshot M3, which I freshly installed in February.

When will 11 M4 arrive on my phone? Will it be available over-the-air?

There was one small OTA update in late February, was that already M4?
If I take a look at System -> Setting -> About Phone, there are various version and build numbers, but there is no number showing any Snapshot number...

Thanks in advance,
Sascha.
I too have a Samsung Galaxy Nexus and I upgraded from CM11 M3 to M4 manually just one week ago.

But I looked it up on my phone and there is an OTA-Update to the M4 build.
Other than that, you can find your current CM11-build under Settings -> About phone and there it says in the entry named CyanogenMod-Version. It should end with your device's code-name (depending on your specific Galaxy Nexus it can be either "toro", "toroplus" or "maguro"; in my case "maguro").

And that update in late february cannot have been the M4-build, because that's just too far in the past. The M4-build was anounced officially by the team of CyanogenMod on march 7th.

I hope I could help you.

PS: If you still do not get the OTA-update, I would recommend you to flash it manually.