Nintendo will release a "special anniversary software disc" for Wii featuring a collection of "fan-favorite" Kirby games this year. The compilation is timed with the 20th anniversary of the first Kirby game, Kirby's Dream Land for the Game Boy.

No specifics on which previously released Kirby games will be included, although Dream Land is surely a lock. No date either, just that it will release "later in the year."

Nintendo also promises "additional Kirby anniversary activities."
Source