Konami claims this is a "significant upgrade" for the game, although it doesn't go into a great level of detail about what's changed. It simply states, "These improvements should greatly refine the gameplay, control input, and character controls for both online and offline play."
The company goes on to promise, "This is the first of many upcoming updates that will focus on improving the Super Bomberman R play experience."
Previously, Konami acknowledged issues with lag when playing online, as well as controller lag in offline play. Those appear to be the target of this first patch.
Super Bomberman R was released alongside the Switch itself earlier this month.
