It'll be out sooner than you think, too.
http://www.nintendoworldreport.com/news/57986/first-mario-golf-super-rush-update-adding-new-course-and-mode
The million-selling Mario Golf: Super Rush is adding new features in a few hours.
Announced for "tonight" by the Nintendo of America social media accounts but for "tomorrow" by Nintendo of Europe, the update will add the following:
- Ranked Battle mode
- The New Donk City course
- A new golfer (Toadette)
- Improvements to the motion controls
Ranked Match will offer color customization for Yoshi (blue, yellow, or red) as one of its rewards for achieving the A- rank.