Nintendo in 2018. released two its biggest games of year with only 3 weeks gap, Nintendo tend to release multiple games that they are publishing in some month, we saw that in 2018. and we already saw this year also in January (NSMBU DX, Travis and Fitness Boxing).

Funny thing is thats not hole Switch 2019. lineup, there will be more 2019. announcements, but of course there is always possibilite that some game can slip to 2020.