Bergman confimed it was bogus.
This. There won't be a cameo in NV...which, frankly, I prefer. Let's keep the bland uselessness that was the vast majority of FO3's NPC cast away from Vegas, please.
That said, I'd love to have Liberty Prime's head make a re-appearance. Imagine, if you will, sneaking through a dimly-lit corridor in the Big Empty, going as slowly and quietly as you can so as not to disturb any of the Pre-War horrors still lurking within. You hear the suggestion of a metallic clank around the corner, and you press yourself against the wall, hardly even daring to breathe. Ever so slowly you reach for your trusty, weather-worn sidearm, silently checking its readiness to be used. You steel yourself for whatever unspeakable abominations of science may await you around the corner, then quick as a whip you spin out from behind the wall, gun up, eyes blazing, mouth drawn back in a vicious snarl...
"COMMUNISM IS A LIE."