I felt that when Ultra Magnus said it on Junk, preparing to meet his end, it sounded like... they would all meet once again in the afterlife (before the matrix was retconned from being a vessel of wisdom, into being a vessel for souls).
But I preferred it's usage at the end of the movie, when it sounded more like a prophecy, that everyone would need to come together to overcome their darkest hour... which should mean all Cybertronians to unite their race and end the great war, but we only saw Autobots celebrating and the great war continued for some time after that.