While Rocket League Credits these challenges from xingwang's blog

Seasonal challenges will stay for the entire season. While Rocket League Credits these challenges will be tougher than weekly challenges, they will also promise better rewards.

New driver challenges will help new players to expand their garage. Only after completing all new driver challenges, or reaching level 20, can players access the weekly challenge.

Challenge rewards include XP, drops, and www.lolga.com customization items. Drops contain various inventory items based on rarity, and they can now contain anything from the Champion 1 series to the Vindicator series.