Psyonix has not gone into element on participant anthems yet from dakunlee's blog

Psyonix hasn't gone into element on participant anthems yet—we're going to study extra the following day—however it's a easy enough idea: "Soon, you will be able to tap into Rocket League's ever-growing soundtrack and play your favored music in the Arena while you rating a aim with RL Trading this new customization choice," says the developer.

Also coming sometime at some stage in Rocket League season 2 is the go back of Rocket Labs, which are experimental casual playlists—anticipate odd mutator combos and non-popular arenas. According to Psyonix, one Rocket Labs playlist will involve a new arena it is a throwback to  Rocket League Trading Rocket League's predecessor, Supersonic Acrobatic Rocket-Powered Battle Cars. Look for that someday mid-season.