Although the second part of "REC" did not have the success of the first, it did get enough box office in Spain and the rest of the world, because it has been sold to almost all countries, so that its production company, Filmax, abandons its great goose that lays golden eggs.
So there are already two new parts of this saga announced. The first will be "REC 3, Genesis" and it will be a prequel where it will be explained how the virus ends up on the well-known floor of terror. On the other hand, "REC 4, Apocalypse" It will be the culmination and closure of the saga with an ending where everything will be explained and finished off.
Hopefully this saga doesn't end in a parody of itself just for wanting to make easy money.