I never cared for the graphical style they used in New Super Mario Brothers (Or the background music for that matter). Much more like the way this Wii U release appears in these shots with all the details. Doesn't look like a cheap budget release anymore and looks much more in line with how I pictured how a modern sidescrolling Mario title in the style of things like SMB3/SMW should look on modern hardware.
Hope they give the audio a makeover while they're at it. Not a single memorable song in either NSMB.
And NSMB2 on the 3DS looks set to maintain the styling they've set on the previous two games.
It was already confirmed.