Both physical as digital editions will be available.
SEGA has provided more information on Super Monkey Ball: Banana Mania, which was previously revealed at the Nintendo E3 Direct.
All pre-orders come with the Bonus Cosmetic Pack (10 items) – this is the only way to get these exclusive items!

The Physical and Digital Editions:
In Europe, the physical Launch Edition features the Reversible Cover, and the 40-Page Art Book will be available at selected retailers.

In North America, the physical 20th Anniversary Edition comes with the Collectible Sleeve, Reversible Cover, and 40-Page Art Book!

The Digital Deluxe Edition will feature 4-Day Early Access (play October 1st)! It also includes four pieces of DLC that will also be available to buy separately for $4.99 USD (or equivalent, so probably £4.99 or €4.99).

Taking a closer look at the DLC:
The Classic Character Pack unlocks classic versions of AiAi, MeeMee, Baby, GonGon, YanYan, and Doctor!

The SEGA Legends Pack enables you to play as a Game Gear, Dreamcast, and Saturn! (Yes, you read that right.)

Getting the Classic Soundtrack means you can switch over to classic Super Monkey Ball tracks!

The Customization Pack is a set of pink cosmetic items for dressing up AiAi, MeeMee, Baby, GonGon, YanYan, and Doctor!

Super Monkey Ball: Banana Mania launches on the Nintendo Switch on the 5th of October 2021.