They announced "big news coming" at 10:15PM, at 10:20, I told my wife,"I'll bet they got bin Laden" at 10:40, news people who had 'sources' could no longer restrain themselves and began leaking what they knew.

As to what it means, and what will happen? That IS speculation. One man whose opinion I respect is Richard Engle, who speaks Arabic and spent much time in Afghanistan. He believes this will 'generally' reduce al Quaida's influence and help end this chapter.
Will there be some individual acts of attempted 'revenge'? Probably...but so what? If we had gotten bin Laden at Tora Bora 9 years ago, there would STILL have been reactions from those who viewed him as a hero!
All we have done is said: "We won't take attacks on us without responding."

What else did they expect?