This photo Billie Joe Armstrong posted on his instagram account may suggest that that is in fact the case..
There may be evidence that the recording process has been happening for a while now… according to the bands long time producer Rob Cavallo Green Day could have as many as 5 new tunes already in the can.
Of Green Day and Armstrong specifically Cavallo said, “Let me tell you, they were just fantastic. He is absolutely at the top of his game, fans can be sure that when they do return, the music will be amazing.”
Could 2016 see the return on Green Day? I hope so!