You should expect “beautiful visuals, features and performance gains,” according to CCP. Most notably, the game will use Apple’s native Metal graphics framework. CCP Games has revealed that it’s developing a native macOS client that will both support Big Sur and bring some welcome improvements for the space-based MMO.
That won’t be a problem before long, thankfully.
If you’ve wanted to play EVE Online using a Mac, you’ve had to settle for running the game in a compatibility layer (namely Wine) since 2007 - and it has only become more problematic with macOS Big Sur.