Darwinianevolution on 30 July 2015
Good question. I think the NX will be, at least, digitally BC with WiiU software, like the XBone is with 360. But yes, we'll see some WiiU games remastered, specially if the NX sells better than the U from the beginning.
The ones that will probably get a remaster are Zelda U and Xenoblade X (maybe SMTxFE and Fatal Frame too). Nintendo is going to put a lot of efford on their advertisement, and they will surely get a noticeable improvement on a stronger system.
