Soundwave on 25 August 2014
I could see it being Mario Galaxy HD 1 + 2 or maybe even a full blown Mario 3D All-Stars (with Sunshine and 64 in as well).
If Zelda U suffers a delay then something like that could at least sorta fill in, my guess is in that scenario, Splatoon would also be moved into the fall.
Perhaps Xenoblade HD (literally just the Wii game but running in 1080p, no other changes) could happen as a bonus disk with Xenoblade X, but I don't think Nintendo will make a big deal about that, much like Bayo 1 being thrown into Bayo 2 as basically like a bonus.
"Remaster" implies something more like Wind Waker HD.
