Well, from what I understand, they've stepped things up lyrically at least. I believe their lyrics are deeper, but this link has some good information regarding the album I'd say:
Two Door Cinema Club announce new album 'Beacon' | News | NME.COM
I don't know much about Jacknife Lee, but the fact that he's produced for Bloc Party, U2, and REM, looks like there's going to be some good influence in this album.