I’m surprised this is getting a remake before The Crystal Shards. Perhaps Nintendo Switch Online + Expansion Pack made that less of a priority.
It's probably because Star Allies sold so well and this is the only other Kirby game that has 4-player multiplayer like that game, so they probably figured it's be the best game to appeal to the current 2D Kirby audience on Switch.
I'm excited since Return to Dreamland is still my favorite traditional 2D Kirby, so having it in HD with new content will be great.