According to the Microsoft Store, Halo: The Master Chief Collection will be available on the Surface Hub. The Hub is an interactive screen for use in businesses and classrooms, so it's not really a gaming device. Its appearance on the list of platforms is pretty unusual, then.
There are rumours that a PC release is imminent, though there's no official word from Microsoft. The Hub also uses Windows 10, which suggests a PC version is in the works, but it shouldn't be treated as confirmation that it's coming soon.
The Hub listing really seemed like a mistake—did anyone really ask for it?—but instead of confirming that, a Microsoft spokesperson just had this to say: "We do not comment on rumours or speculation."
If it was added in error, that's something Microsoft could have fixed pretty quickly, but it's still listed in the store.
A Master Chief Collection announcement has already been teased, with Tuesday's Inside Xbox show promises "exciting news". Check back tomorrow to find out if we're getting the gift of remastered Halos.