Updated story (June 14th): Though Trials Rising was confirmed for Nintendo Switch during Ubisoft's E3 press conference, the game's upcoming closed beta won't be coming to the platform, an Ubisoft spokesperson has confirmed to Eurogamer.
Instead, we can expect it on PS4, Xbox One and PC, with now available.
There's no word on what the closed beta will feature, but Ubisoft mentioned during the conference it will arrive later this year.