Nintendo of Japan's July release schedule has some pretty high-profile DS games on it that are total surprises to us. First, on July 10th, Nintendo plans to release a new game in Tose's Densetsu no Stafyplatforming series, called Densetsu no Stafy: Taiketsu! Daiiru Kaizoku-dan (Legend of Stafy: Confrontation! Daiiru Pirate Squad).
On July 31st, there is a listing for Rhythm Tengoku Gold, which is a sequel to the WarioWare team's amazing GBA rhythm minigame collection, Rhythm Tengoku. According to the announcement posted on the Rhythm Tengokusite, the new game uses the stylus (of course) and features many new rhythm games.
Finally, though it doesn't appear on Nintendo's schedule (the August calendar isn't up yet), their page for the Fire Emblem remake now shows a date: August 7. There goes any fear that Nintendo didn't have anything planned for the second half of the year!