According to Video Gamer EA pulled the plug on pre-production of Dead Space 4 at Visceral Montreal following the weaker than expected reception of Dead Space 3 earlier this year. Recent rumours also point to Visceral Montreal closing up shop as work on Army of Two: The Devil's Cartel concluded.
It remains to be seen whether this is just a temporary setback for the Dead Space franchise or whether EA plan on putting the series in cold storage.