Mario Tennis Open for 3DS will release in USA on May 20, Japan on May 24, and Europe on May 25, Nintendo announced during today's Nintendo Direct webcast. Mario Tennis Open is being developed by Camelot, the team behind the Mario Tennis series that started in 2000 with Mario Tennis on Nintendo 64.

Before today's announcement, the game was known as "Mario Tennis."

Links:
Nintendo Direct 02.22.2012 (NOA)
Nintendo Direct 22.02.2012 (NOE)
Nintendo Direct 2012.2.22 (NCL)

Super Mario Bros. is now available on the 3DS eShop.  Previously available only to 3DS Ambassadors, the 3DS version is identical to the original NES release, albeit with a save state function.  The game is available for $4.99 on the 3DS eShop, and 3DS Ambassadors can upgrade to the newer version for free. Early Wednesday morning in North America, Nintendo released an update for the the 3DS Virtual Console version of Super Mario Bros.  While the game content hasn't changed, the emulator and manual have.  The title now includes the standard 3DS Virtual Console save state function and a full manual.  Interestingly enough, the manual seems to adhere fairly closely to that of the original game, at least in terms of background story and character names; for example, Princess Peach is referred to solely by her original U.S. name of "Princess Toadstool."

This update was released last week in Europe, and even earlier in Japan.

Mario Party 2 is now available as a downloadable reward on Club Nintendo. From today through February 29, Club Nintendo members can redeem 150 Coins for Mario Party 2, which normally costs 1,000 Wii Points.

Art Academy: First Semester (DSiWare) was the only other game added to the rewards catalog today.

Link: Club Nintendo

Dr. Mario Online Rx and Dr. Mario Express are now part of the Club Nintendo rewards catalog for a limited time. Members can trade in 100 coins for Dr. Mario Online Rx on Wii (normally 1,000 Wii Points), and 150 coins for Dr. Mario Express on Nintendo 3DS (normally $4.99). The two Dr. Mario games, The Legend of Zelda: Majora's Mask, and Kirby's Dream Land will be available as rewards through January 31.

Link: Club Nintendo