There were rumors floating around even before Phil Knight recently mentioned a uniform change in the near future and if you want to believe a reliable source on chatforquacks, the black helmets are no longer just a rumor, he's seen them.
As we've heard (but not confirmed) for a few weeks, black was apparently the color of choice for this weekend's homecoming matchup with UCLA. Though, I never found one legitimate source that said they had seen the team practicing with them recently. Moseley even just confirmed that the Ducks will be wearing the normal green helmets tomorrow but didn't elaborate (update: he has a little).
It seems like things have been pretty quiet this week so I'm not sure what to think. I'd like to believe the rumor and all the smoke & mirrors (ie. keeping the media at bay) but I just don't think the Ducks will don new helmets without practicing in them first and someone leaking that information.