tl;dr The new Evil Dead movie isn't actually a remake, it's a different set of people that found the cabin. In the coming years we will see sequels to the new Evil Dead movie, as well as a proper follow up to Army of Darkness. The series will come to a grand finale in Evil Dead 7 where both storylines cross over.
I want to think this is an early April Fool's joke. I'm definitely excited for the Army of Darkness sequel but the rest sounds ridiculous.