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One of the main selling points of nexus devices is that they tend to get timely updates (or at least much more timely than other phones). Particularly if you bought through Google Play, Nexus phones tend to get OS updates damn near immediately.

I would assume so. Part of the Nexus experience is getting the new versions. I might have some doubts if the Nexus 4 was a couple of years older, but it is still a relatively new Nexus device.

It will. The question is whether Galaxy Nexus will get it, as Nexus S will certainly not (stopped at 4.1).