Bloc Party tease new album with cryptic clip

If you're the type who likes to spend your lunchtime confused by Crosaire, then Bloc Party are about to be your new favourite band.
Kele Okereke had already confirmed that the group were working on the follow-up to 2012's Four, and today the group teased us with a very short clip featuring shots of them in studio, followed by a view of a graveyard.
And to be perfectly honest, HP doesn't have the slightest clue what it means.
Should we be scared? Excited? Are they threatening to kill us all? Who knows. At the very least, though, we can presume that something notable involving the four-piece is not far away...