This has now been confirmed by Warner Bros.
Nintendo Life contacted LEGO Worlds publisher Warner Bros, and got a confirmation that the game is indeed coming to the Switch. There’s still no world on the release date of that version though. It’s also still not listed on the game’s website. Nintendo Life did ask about a release date, so if they update with any new info I’ll post it.
currently we have announced that we are planning to release LEGO City and LEGO Worlds on switch
— arthur parsons (@arthur_parsons) January 23, 2017
Arthur Parsons, head of design for TT Games, confirmed on Twitter that LEGO Worlds would be coming to Switch alongside the already announced port of LEGO City Undercover. LEGO Worlds is described by Warner Bros. as “an open environment of procedurally-generated worlds made entirely of LEGO bricks which you can freely manipulate and dynamically populate with LEGO models.”
There’s no release date for the Switch version, but I’d assume this year. The other versions release on Feb. 24th so there’s a chance of it making launch, depending on when they started working on the Switch version.