User blog comment:Madman97/The Elder Scrolls Online: Morrowind Announced/@comment-25896372-20170201100442/@comment-1600847-20170201130006

Bethesda did say back in 2016 we'd not get a new TES game until "we finish our current 2 big projects". Best case scenario, we get one in 2017 and the other in 2018, then TES VI in 2019. But I think the 2020s are more likely.