The LP's cover, which appears below, shows four coloured rings against a black background.
Discussing the set, which is out August 20, frontman Kele Okereke said: "The record is the sound of four people in a room, loving what they do and doing it to the best of their ability.
"It is the sound that only the four of us could make, and I am prouder of it than any record we have ever made".
The album - produced by Alex Newport (Death Cab for Cutie, The Mars Volta) - marks their first since 2008's Intimacy and their extended hiatus, which saw Okereke release a solo LP.
Bloc Party recently extended their headline UK tour by announcing a further eight dates for October 2012.
Watch the Four album trailer below: