If this is not a remake/reboot, then why the chuff is it being called "Flatliners?" Did they not realise with the 2011 prequel to The Thing, that calling it the same name as the first movie in the franchise, will only confuse the hell out of people? it's dead lazy that Hollywood studios can't even be bothered to come up with a suitable title. If they really are THAT stuck, then simply stick a 2 in front of the title, job done.
"Hasta la vista, baby."