UPDATE: The pack is now available in North America! And more importantly, it’s free!
The Golden Classic Course DLC pack for New Super Mario Bros. 2 was announced today for Japan. The set of three levels are all throwbacks to past games, with each level coming from games like Super Mario Bros. 3 and the original Super Mario Bros. The pack is available as a free download until January 31. The pack can already be downloaded, and again, this is Japan only and we will update when the pack is announced for other regions. Six levels have been seen:
Mario Bros.: Round 1
Super Mario Bros.: 1-1, 1-2, 1-4
Super Mario Bros. 3: 1-1, 1-5
In addition, the total worldwide count for coins collected has surpassed 300,000,000,000 coins. Perhaps this is why we are getting retro levels!