It's my speculation that they could possibly issue new light saying it's impossible to know exactly when Satan was cast out of heaven. They might say that we only know Jesus was enthroned in October 1914 but we can't know exactly how long after this (in human chronological terms) he was cast out, because humans perceive time differently to spirit creatures in heaven and what could seem to Satan and Michael like a battle of a few hours. could be experienced as months or years on the human time scale.
Perhaps they will say that WWI approximately coincides with the war in heaven between Michael and Satan and that the heavenly war perhaps explains the outbreak of WWI - Satan was so preoccupied with Jesus imminent enthronement and the heavenly battle that immediately ensued that he was too busy to effectively oversee his earthly kingdom, resulting in a temporary state of global turmoil that we know as WWI.
They will say that they love this new teacing and that it makes sense because WWI started in late July while Jesus was clearly enthroned in October, therefore WWI clearly could not have been the result of Satan's ouster since he was ousted soon after Jesus' enthronement - on or after October, and not late July when WWI actually started.
Whatever the case, the fact that they put Satan's ouster as "about 1914" clearly indicates that a new light bulb is about to be unveiled by GB 2.0.