RL Items Breakaway happens on Throwback Stadium from xingwang's blog

"Assuming you haven't looked at them previously, Winter RL Items Breakaway happens on Throwback Stadium (Snowy) and replaces the standard ball with the hockey puck from Snow Day.

"In Spike Rush, the Spike power-up from Rumble Mode is locked in later opening shot. The ball transporter can't support and is obliterated on sway, however can pass the ball to colleagues to pull off some super cold plays!"

Obviously, the thing shop will likewise be loaded Rocket League Items Shop up with heaps of new things, so have your Credits prepared.