A press release by Nintendo UK confirms that the upcoming Donkey Kong: Country Returns port for the 3DS will indeed contain new content.
Here are the important bits you can go through:
Grab the letters that spell out K-O-N-G and nab puzzle pieces hidden in each stage to unlock extra content, like super-tough Trophy levels. Unlock and conquer every one of these special stages and a brand new surprise awaits!
New mode makes the going just a little easier, giving Donkey Kong and Diddy Kong three hearts each instead of the usual two, letting them Kong-a for longer! Spend your hard-earned Banana Coins on helpful items from Cranky Kong’s shop, and pick up new items that help save you from falls, allow the Mine Cart and Rocket Barrel to take a second hit, and even let you use a DK Barrel whenever you like.
Discover brand new content created just for Nintendo 3DS.
Donkey Kong: Country Returns 3D is scheduled for release next month on May 24th for the 3DS.
Source. Nintendo UK