If Google ships the Nexus with an FM app, that would be a departure from previous practice.
The Nexus One shipped with the HTC Desire FM hardware intact, but no app.
The Nexus S did not have the Silicon Labs Si4709 FM chip that the Galaxy S did, and the Broadcom BCM4329 BT/WiFi/FM combination chip was not wired to allow FM.
This Galaxy Nexus apparently has a Broadcom BCM4330 BT/WiFi/FM combination chip like the Galaxy S2 has. But the S2 uses a dedicated Silicon Labs FM chip like the original "S1".
I doubt the BCM4330 will be wired for FM, so I'd guess there must be a Silicon Labs FM chip if the Galaxy Nexus supports FM.
I doubt Google would have created their own FM app, but who knows ? Would it be incorporated into the music app ? Would they use Samsung's FM app, perhaps modified ? Or have they decided their new music store sales will be improved if they neglect FM ?
And if there is an FM app in Google's Galaxy Nexus, can we presume that the source code will be open ?