Tony Hawk's Pro Skater 5 supports up to 20-player multiplayer, at least on PS4 and Xbox One.
Developer Robomodo noted this on the PlayStation Blog, where it also confirmed that the PS3 version will have no online whatsoever. A rep for the game confirmed to Eurogamer that the same is true of the Xbox versions.
One of the more interesting online features in Pro Skater 5's current gen version is that you can build their own skatepark and share it with other players
Tony Hawk's Pro Skater 5 is being developed by Robomodo, who previously made Tony Hawk: Ride and Tony Hawk: Shred.
It's due on PS4 and Xbox One on 29th September, while its PS3 and Xbox 360 versions will follow later this year. Here's a new trailer showing off its hectic multiplayer in action: