A Steam Community Group Announcement tells us to expect a free update tomorrow for Rocket League to add new Portal-themed content to the hard-driving racing game (thanks MCV). This does not involve any of the signature portals from Valve's puzzle series, but will offer the chance to pick up a number of cosmetic items, and apparently the cake sticker is no lie. Here's word:

Yes, dear friends, in an amazing display of professional badassery, the fantastic folks at Valve Software have given Rocket League players one of the coolest things they'll ever see in our game -- officially-licensed Portal customization items that are absolutely FREE!

Obtainable by playing a full game of Rocket League, the official Portal items are potentially rewarded at the end of every match, win or lose. All you have to do is keep playing until the match ends and your chance to earn a new Aperture-themed goodie of your very own.

What kind of Aperture-themed goodies, you ask? These ones!

• Cake (Topper)
• Conversion Gel (Rocket Trail)
• Propulsion Gel (Rocket Trail)
• Repulsion Gel (Rocket Trail)
• Aperture Laboratories (Antenna)
• Cake Sticker (Antenna)
• Companion Cube (Antenna)
• Personality Core (Antenna)
• PotatOS (Antenna)
• Pretty awesome aren't they? You can start getting yours, FOR FREE, December 1