Though these aren't confirmed as official posters for [REC]4, they are still very cool, and feature Angela Vidal, who fans of the series remember managed to escape the quarantined building.
Here's the [REC]4 set up:
Angela Vidal, the young television reporter who entered the building with the fireman, manages to make it out alive. But what the soldiers don’t know is that she carries the seed of the strange infection.
She is to be taken to a provisional quarantine facility, a high-security installation where she will have to stay in isolation for several days. An old oil tanker, miles off shore and surrounded by water on all sides, has been especially equipped for the quarantine.
[REC] 4 Apocalypse is directed by Jaume Balaguero and is reportedly set to film this spring.