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No it's not. In the US it's available from Verizon and Sprint as the LTE version (not completely compatible with the HSPA version) and there is no device available from AT&T or T-Mobile. You can buy an unlocked device directly from Google, but there is no subsidized version available for AT&T or T-Mobile customers.

I bought my HSPA version unlocked in the Netherlands.

I don't think you can consider the Galaxy Nexus a Samsung phone. Yes, it's built by Samsung, but they're more a contractor for Google in this case.

The Galaxy S II and its differing variants in the US all still run Android 2.3, with only promises that they might eventually get an update.

Also available directly from Google.