Given that the header trails off, I prefer to fill in the blank with other ideas than the obvious.
I'm inclined to agree; my baseless speculations are that it's either a $100,000 win, an improbable (difficult) solve, or the rather out there guess of a one million dollar loss.
Unlike the second million dollar win, BAV has no evidence to believe this is the straight thought of OMGMILLIONBUX, and the staff there nearly always know if something of that nature is due to happen. The only thing we have, as fans, are what Henke has already said.
To contrast our opinions, Travis, Chad Mosher tweeted on 8/27, for whatever you make of it: "Speaking of Wheel of Fortune, the 32nd season may just see a third milestone achievement happen..." Strangely enough, the premiere week taped on May 1st this year, and to my knowledge, the most recent taping, prior to the date of that tweet, was on 8/8/14.