These Golden Eggs are in lieu of event crates from aaron's blog

These Golden Eggs are in lieu of event crates, and don't require keys or decryptors to open once you've purchased them with event currency. You'll be able to trade balloons for up to ten Golden Eggs, and inside you'll find "one of over 60 possible Customization Items from our retired Champions Series Crates." It's worth noting that the much-coveted Zomba wheels were in the Champions Crate 4, meaning some very lucky players might unlock a set of previously-discontinued Zombas.

The official announcement didn't mention if these items will be tradeable to other players, just stating that Golden Egg items can be traded in. However, Psyonix Community Manager Psyonix_Devin confirmed on the /r/RocketLeague Discord that Golden Egg items will be tradeable to other players, meaning receiving some of the rarer Champions Series items could be worth quite a few keys.

As a reliable and professional seller, Lolga.com offers Rocket League Items, Keys and Crates with cheap price, instant delivery, safe transaction and best service. You can get what you need and more. Cheap RL items for hot sale at our site, and our stable supply of game resources ensures you to get RL Items, Keys and Rocket League Credits here fast and easily!