Announced during the Nintendo Direct.  The Wii U game is coming out March 18 while the 3DS game releases on April 21.

First Screens:

Announced during the Nintendo Direct by Bill Trinen.

Screenshots:

Today’s Nintendo Direct introduces what they’re calling the “Year of Luigi.”  Luigi has been a part of the franchise almost since its inception, but always in a supporting role (other …
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Announced during the Nintendo Direct.

Updated with in-game screenshots:

Iwata announced a brand new Mario Golf for the 3DS.  The game will release this summer and is developed by Camelot who has a lot of experience with Mario Golf …
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Iwata announced Mario & Luigi Dream Team for 3DS, continuing the ‘Year of Luigi’.

First Screens: