Well your question was whether Microsoft is going to support Tegra as a platform and the answer is they already do. But really Nvidia is probably going to brin

Well your question was whether Microsoft is going to support Tegra as a platform and the answer is they already do. But really Nvidia is probably going to bring a specced down version of it's Grace Hopper chip, which is also a Tegra chip (T241). So i guess they won't deviate from that.