Yeh pretty much what has happened is the Nintendo had to stop it with the DS in order to get the 3DS to become more popular, if you check the games released in 2012, there really aren't that many, the only recent DS game is probably pokemon black and white 2, which is most likely the last DS game we'll see :|...
I still went ahead and got a DSTwo, considering my last portable was the Gameboy Advanced SP, so I have plenty of old DS games I need to play xD... and then seeing how I have a 3DS XL I can then start buying 3DS games... which will blow cause I really can't afford to pay $40 for a game >_>