We have already heard that there are at least three different builds of Android being used on the Samsung Galaxy Nexus smartphone.
One of these are said to be controlled by Google. Other two are controlled by Samsung apparently.
If you own the Galaxy Nexus and want to check out which build it has, GN Official Update Checker is the app for you.
This is a tiny application, which checks whether your Samsung Galaxy Nexus is updated by Google directly or not.
Some Galaxy Nexus devices are updated by Samsung or carriers, but you can flash own images on every device.
It is still not clear how the update process would be affected by this policy. Google has confirmed that at least for the Verizon model, Samsung and Verizon are involved in delivery of the update to the end user.
@AndroidPIT Built by Google with input from Samsung, final approval by Verizon. Supported in AOSP.
— Jean-Baptiste Queru (@jbqueru) December 17, 2011