BSN reported that Nvidia has won the contract to create processors for the next Nintendo DS, which the site says is scheduled for a late 2010 announcement. They backed it up with “confidential sources” but who knows how trust worthy those are. Their sources also said that the new platform would be able to play old DS games along with the system’s new games.
I’d take this rumor very lightly, but its worth mentioning since the DS is fairly old at this point, hopefully your DSiWare software would be able to transfer over. It is also worth mentioning though that Nintendo has said in the past that they have created a new hand held during the DS’s life cycle, but ended up scraping it because it wasn’t the right time and didn’t have enough changes for them to feel worth a release.