Psyonix published a blog outlining additions and changes coming to Rocket League, not the least of which is an eight-sided arena themed after a VR space.
“The Rocket Labs playlist adds another stadium to its lineup with the debut of ‘Octagon’ this September!
Available for both Online and Offline Exhibition play, ‘Octagon’ is VR-themed like other Rocket Labs Arenas, but the large, eight-sided walls are what set it apart.”
Those maps, along with Rumble mode, will be released in Rocket League’s September update.