According to various websites it has been confirmed that season 2 footage will tie in at the end of wings of freedom, although some sources say that there is supposedly season 2 footage in the recent trailer that was posted.

I can't seem to see any trace of season 2 footage, but certainly new footage is in there that ties into the events of season 1.

It is likely that the movie will end the same way that chapter ended, with the twist of "WALL ROSE HAS BEEN BREACHED" instead of the way season 1 left off with the "WALL TITAN" twist... Or maybe it may end the same way with a post credits teaser trailer for the upcoming season (release window please, it's unlikely but atleast give me a quarter release at that). That serves people right for leaving before the credits were over. Marvel films taught me that.