The game launched in Japan last year, and publisher Jupiter Corporation has previously stated that it will also see release in Europe in the same month as North America. Prequels Picross e, Picross e2 and Picross e3 are all currently available for download on the 3DS eShop.
Here's the official word from Nintendo's site:
With Micross and Mega Picross modes! The 4th game in the Picross e series, with a Navigation Feature! As fans requested, new 20x15 puzzles have been added. Micross and Mega Picross modes are also included, with 150+ new puzzles! Tutorials and rule options let newcomers to the series start playing with ease. With save data from previous games, you can also play additional Special Puzzles. Picross is a "Picture Crossword Puzzle Game" where numbers act as hints to complete images. The rules are simple and easy to grasp. Anyone can do it!
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