source: [REC]3 Génesis se estrenará el 30 de marzo de 2012. europapress.es (http://www.europapress.es/cultura/noticia-rec3-genesis-estrenara-30-marzo-2012-20110905170656.html)

for the non spanish speakers, and for the 3 people that saw rec1/2 in the US:

the movie is stated for an european release of 30 march, 2012.

a teaser trailer will be shown on the movies official social sites (facebook, etc) on 16 september.

Loved the first one.
Especially the part where
the little girl turns and bites her mother and runs off all zombified.
Or the firefighter guy falling to the lobby. Jumped the first time I saw it

First one was great, but I heard the second one was bad. Do I still need to watch it to understand the third one?

pretty much.