The pair of new 3DS eShop games are based on the mini-games in Kirby: Triple Deluxe.
Kirby Fighters Deluxe and Dedede's Drum Dash Deluxe are out now on the 3DS eShop in North America for $6.99 each.
The two games are expanded versions of the mini-games in Kirby: Triple Deluxe, which came out in May. Kirby Fighters Deluxe adds five new stages and a team battle mode to Smash Bros.-like fighter. Dedede's Drum Dash Deluxe adds seven new stages to the unique rhythm game. Both games also feature bonus content if you have StreetPass active for Kirby: Triple Deluxe.
The pair of eShop games came out in Japan back at the end of July. No word on a European release as of yet.