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.
My (locked) thread about how difficulty should be a decision for the developers, not the gamers.
https://gamrconnect.vgchartz.com/thread.php?id=241866&page=1