JetBlue TrueBlue - Flight 641

Anyone have any information on flight 641 today from JFK to SFO? It was diverted to SLC. I was trying to figure out why my friend coming to LGB from SFO was so delayed (2 hours now). I found out the plane he was to catch was coming from JFK and got diverted to SLC for some reason. :confused:

My friend just sent me a text, JB told them flight 641 taxied for a long time at JFK and had to make a fuel stop at SLC due to strong head winds. Now they are over 3 hours late!

According to FlightAware they were @SLC for over 2 hours. Seems lenghty for just a fuel stop. Are you sure that's all it was? Any word if they actually pulled into a gate or was it just serviced on the tarmac? Were passengers permitted to deplane?