The basic gameplay of the original title had you manipulating risng sqaure blocks (each with a diagonal line in it) until you were able to make a line from left to right. The DS version will apparently create a sound every time you're able to do so, and in repeating the process, you'll be able to make your own music. As you may expect, this is all done via the stylus.
Published by Namco-Bandai in Japan, its expected to release there in the fall. There are currently no plans to release it in the U.S.