the earliest we will see a new MK is 2020.
Nintendo Kart? Maybe 2019.
And by the way, we didn't progress to far since mario Kart 8, MK9 wouldn't look much different.
Im getting a bit more nervous about this year.
I had a wii U. Im not aware of any First Party Game this year that Im interested in (Except Fire Emblem).
There were just to many Kirby games in the last few years, and only canvas curse hat a unique new art style.
If they don't announce something, they probably expect third party's to hold 2018 while they work on there 2019 line up.
For now the first half only has Dark souls and some indies for me.
Regarding MP: I don't expect it 2018, and Im not sure if the trilogy would be a good idea.
On the one hand, it could boot the interest in MP4, on the other, if mp4 is to removed from the gameplay of the old ones it could end in a backlash for the 4. entry.