No cause for alarm here, folks, but your brand new Verizon Galaxy Nexus is going to get a little update once it's activated. Bugfixes, mostly. And since you probably haven't actually used the Verizon Galaxy Nexus without this update, you won't really know what you were missing.
And before anybody freaks out about it getting an update on Day 1, remember that pre-release updates are hardly unusual. Update it and go about your business.