Mind clarifying what you mean? Personally, I'm pretty convinced that the next Xbox is coming in 2019. I think E3 2018 is too early to start talking about it, so I fully expect a tight reveal to release window in 2019.
If these games aren't releasing this year, I'd imagine they'd wait to talk about them alongside the new hardware in 2019.
I mean I think it makes mores sense to announce these games at E3 2018, then sprinkle them in throughout 2018-2019. E3 2019 will be about the next Xbox, with a release either late 2019 or early 2020.