Welp, if Kotaku says it, it's 2020.
I expect one of them launch 1H 2020 especially now that Switch has done it successfully, a 6-9 month between the 2 would give each breathing room and do good for both consoles. Lots of people who would get only 1 console in November would probably get both that way, me included. Xbox is getting more attractive with the new investments in 1P and things like BC and Gamepass. I think MS will likely go first, they seem more disruptive lately while Sony will go for the traditional fall season. Though Sony skipping E3 could also mean a reveal closer to launch, like Nintendo did it, a PS Meeting in October perhaps, or PS Meeting morphed into PSX 2019 (perhaps even for launch fall 2020)?