Emily Rogers Rumour: There's a lot of Wii U ports coming to NX

[Miyamotoo]

Nautilus said:
This does not necessarily mean no BC, since the ports could well be a definitive version of Smash and XCX for example, games that would benifit from the extra power and/or getting all DLC in one package.Though yeah, that makes NX having BC harder to believe.

I very doubt Nintendo would make Remaster of so many Wii U games if NX have BC, if this is true its almost certain that NX will not have BC.