Players will receive a Vault 111 suit for free with the coming massive update for Rock Band 4 on the 8th of December. (egmr.net)
With that being said however, we have seen Switch games before this one receive massive updates that dramatically improved performance, such as Minecraft now supporting 1080p when docked and Super Bomberman R being updated to run at 60 FPS, so there is still hope for this one to be improved upon after release. (cubed3.com)
Capcom's Street Fighter IV model was to release massive updates to the game every couple of years, which included new characters, fighter balancing, new features, etc.. (cogconnected.com)