During the SEGA Fes stage show the Japanese developer showed off multiple Olympic Games that will be coming at the end of 2019 and 2020. One of which was the regular Tokyo 2020 Olympics: The Official Game.
The other game however was for us Nintendo fans perhaps more important. Mario & Sonic at the Tokyo 2020 Olympic Games was also announced and will mark the retun of the series since 2016. Any big info has yet to be given, but both games will launch in winter of 2019 and you can find some announcement pictures below.