Hello! That video is great, isn’t it? In all honesty, I doubt “Sister” will be on the new album; it’s not actually a new song, as it was released on Mumford & Sons’ second EP Love Your Ground in 2008, and then the band released a “new studio version” soon after. Similarly:
…I doubt they’d release “Liar” again, too. The only song that’s been confirmed to be on the new album is “Below My Feet.” Everything else is still up in the air, though the list in that last question has great potential. I will say, however, that “Broken Crown” samples the original “To Darkness,” so it’s highly unlikely that “To Darkness” will be included; it was already released on the “Little Lion Man” single, anyway. “Feel the Tide” is one of the band’s oldest songs, and it was also included on the Love Your Ground EP, so that most likely will not be on the new album, either. Furthermore, it would seem you are correct that “Home” will probably not make it onto the new album (unless the band are pulling one over on everyone!). As far as new, “unheard” songs are concerned, who knows? The band have said that they like to “play in” their new material, but perhaps they’ve held back a song or two.
All of this is to say that only time will tell what will end up on the new album. September 24th is getting closer every day!