I know what happened, i just spoke to a friend of my fathers, who works in New York, and comes home once every 2 weeks.
This is what happened:
They departed according to scudule from JFK. They flew towards Boston, and after that towards the atlantic. My fathers friend was watching the world map on his ptv (he was in buisness class), whilst most people were watching a movie, or reading.
After about 1,5 hours of flight, he suddenly noticed that the plane was turning around on the map...and he began to worry (--->hi-jacking). 5 minutes later the captain explained that the plane was experiencing Generator problems, and the pilot prefered to change planes than to risk flying over the atlantic with the problem.
They therefore flew back to JFK, and a fresh plane was waiting directly at JFK. They then flew back, with no problems.
My friend told me that there was no real panic on the plane, but ofcourse people were a bit scared.
I'm atleast glad the pilot took the right decision to return to JFK....but what strikes me is the fact that they didnt land at boston, because they were flying near to it....i guess the situation wasn't that urgent
Hope this information is helpful

Joost