Prestige levels will be added with the new season. Every level gain after level 999 will grant 1 prestige point, up to 100. These points can be used on prestige passive tree to alter your endgame mechanics.
There are 162 total points on the tree but you can use 100 of them freely. You can also reset the tree anytime without any cost.
Next Season Will Be The Beta Of Full Release (v1.0)
Next season will be the beta of the full release version (v1.0). Almost all features of v1.0 will be in the next season. A couple of missing features might be added later on the second beta version.
The date for the next season will be announced soon.