All we really know about the game (from the Gamestop product page) is that Gameloft is developing it. We sincerely hope that doesn't mean we're getting a cell phone port.
What isn't shrouded in mystery is Mad Catz's interest in cashing in on Assassin's Creed. On February 15th, they will release an Assassin's Creed-themed DS accessory pack, containing a DS system case, six card cases (which appear to snap together), two styli, a cleaning cloth, a car charger, and a lanyard. All of this is labeled with the Assassin's Creed logo, making every component of your DS experience potentially embarrassing if the game turns out terrible.