Katamari Damacy Reroll will only be available digitally in Europe
Katamari Damacy Reroll will only be released on Switch digitally in Europe, Bandai Namco recently confirmed to Nintendo Everything. That means a physical version will not be offered in the region and it will only be sold on the eShop.
In North America, the situation is slightly different. Katamari Damacy Reroll will be sold physically, but only at one retailer. GameStop has the exclusivity on that one.
Japan seems to be where Katamari Damacy Reroll is receiving the best treatment. It will be sold at most retailers without any exclusivity, and digital will still be an option.