As much as I was down on MT: Ultra Smash for it's bewildering lack of content, we have to remember MG: World Tour was packed with content and we got even more via DLC, so considering this is the same team it could go either way.
And with this slated as a Spring 2017 title(the supposed timetable of the release of the NX hmmmmm) it has me wondering if this isn't part of something bigger for the Mario Sports brand going forward.
What if Mario Sports Superstars is something they plan to add to as time goes on? Start out with Tennis, Golf, Baseball, Soccer, and Horse Racing at launch, and then add more sports through dlc as time goes by.(say... basketball, volleyball, or hockey maybe? Basket weaving?)
Regardless, content will be key with me. I'm not really worried about the roster, that looks great already and as long as there is a healthy selection of stadiums, race tracks, courses, and courts for us to play on, this should have huge replay value what with it being online.(*cough*Star Rush*cough*)
At any rate, I look forward to seeing what comes of this game.(And seeing more Mario Horses!

)