New Nintendo Platform Teased at Conference, "NX"

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Soundwave said:

To be honest though XCX and Zelda hold up OK (blurry image quality of the Zelda pic notwithstanding).

It's also why I don't think Nintendo will go too crazy hardware wise with their next console. If the next portable can handle Wii U graphics while the console "brother" device to that is 2x-3x the handheld ... man Nintendo is going to have some very nice looking games even if they don't match the PS4 on raw horsepower.

Maybe I'm crazy but I think Final Fantasy XV looks better than Uncharted 4. 

Oh don't get me wrong, I agree that XCX and Zelda still hold up well. And I'm happy with the level of graphics Wii U offers; games like Trine 2 Director's Cut and Captain Toad Treasure Tracker look absolutely gorgeous.
I'm just pointing out that from a purely technical perspective, porting a full fledged PS4 game to Wii U wouldn't be a simple process.