never
He is coming back at the 2011 Royal Rumble.
I can, with considerable confidence, state that the answer to this is "yes" (despite not knowing anything about the WWE or who "JBL" is). I'm fairly certain he's not actually immortal.
2011 royal rumble for sure
It doesn't look like he will be back anytime soon.
He has left WWE.
no
No, JBL was WWE Champion.
JBL has held the title longer. He has held the WWE Title for 280 days. John Cena held the WWE title longer than JBL.
No, I don't think so. He retired April 5, 2009.
JBL quit the WWE at Wrestlemania 25.
JBL