Google saw fit to distribute the Samsung Galaxy Nexus, Nexus 7, and the Nexus Q to all of the developers at today's Google I/O event, but the Galaxy Nexus wasn't running Android 4.1 out of the box. Instead, it was made available as an over-the-air update (ours just hit) — and with every OTA update comes a direct download. The ROM, which clocks in at 156MB, will technically only work with a certain variant of the Galaxy Nexus, the "Takju" US GSM version — and more specifically it may only work on the devices given out at I/O.
The fine folks at XDA-Developers are already trying it out on that and other variants, of course, so there may yet be hope for those of you who can't wait for an official relaase. So if you're a Galaxy Nexus owner who is savvy with ROM flashing and the subtle distinctions between Nexus hardware versions, you just might want to give it a shot.