The time of waiting is nearly over, or so they say. A member of the Rocket League team mentioned on the Steam forum it will be due very soon at the end of Q1 2016.
QuoteWell like I mentioned above it should be coming by the end of Q1 so we should be seeing the SteamOS and OSX versions coming out very soon :)
Correction: The developer meant to say Q2.
QuoteSorry, I misspoke -- we're targeting Q2. Apologies for the mistake
I do hope they wait is really worth it. I've been wanting to play it a lot, and the online multiplayer is still very healthy right now so it would be a great game to have on Linux.
It was originally due before the end of 2015, then Valve caused a delay, so we have been waiting quite some time.
About the game
Soccer meets driving once again in the long-awaited, physics-based multiplayer-focused sequel to Supersonic Acrobatic Rocket-Powered Battle-Cars! Choose a variety of high-flying vehicles equipped with huge rocket boosters to score amazing aerial goals and pull-off incredible game-changing saves!
Are you still excited? My excitement has worn off a bit after so much waiting, but I imagine when it drops I will be very happy.