The reduction of new IP coming out of Marvelous Entertainment isn't as total as we'd heard. In a recent investor Q&A summarized by air-be and translated by Siliconera, the company revealed that it will have original IP in the next fiscal year, for "new hardware." The current fiscal year ends March 31, 2011.
This hardware is likely to be something other than the 3DS. The company refers to that system explicitly when discussing its plans to release a Harvest Moon game on Nintendo's extradimensional handheld. That Harvest Moon game, by the way, also won't be ready until the next fiscal year, which means that you won't be planting crops deep into the ground -- with visible depth -- at the 3DS's launch.