Microsoft has been weird with this game. They hyped it up as launch title, game for 10 years, when it was far from ready. They released it a year later, with decent multiplayer and single player, but slowed down right after season 1. They woke up and got Forge working and then slept again. Even the recent showcase had the usual ESO and FO76 updates but nothing about Halo Infinte. Now they are teasing something new for next year, without even asking users to consider playing Halo Infinte in the interim time.
Even Forza Motorsport plan seems to be similar. Hyped game as 'platform', meh launch, even meh support, no mention in their showcase.