At Bethesda's E3 2019 conference, a reboot of id software's Commander Keen was announced. Director Kira Schlitt described it as "a classic Saturday morning cartoon in free-to-play mobile form".
The game does have a nice art style, a story mode, and a realtime PvP mode. It doesn't quite look like that description in action however, and the presentation didn't go into much depth on how it works.
We won't have to wait too long to find out though: it will "soft launch" this summer on iOS and Android phones.