3DS Buzz Reports that the name of the game is actually Kirby's Return to Dreamland, contradicting earlier reports of a name change by Go Nintendo. They have also linked to the official Nintendo Website confirming the name.
According to a recent Nintendo Power Survey, Kirby Returns to Dreamland underwent a name change. It is now called Kirby: Return to Dreamland. Could name changes for other titles be far behind? Super Mario Land 3D anyone? Or how about Mario Kart 3D?