Larian Teasing Baldur's Gate 3?

There's a conspicuous III on the Larian Studios website to tease us. The first thought might be that this is for Divine Divinity III, but PCGamesN rounds up some indications that this may actually be a tease for Baldur's Gate 3. Last October Larian denied they were working on BG3, but now there are firmer hints that they are. Here's word:
If you inspect the source code of the page, you can download the MP4 file of the teaser video. If you open up that video in a text editor, you’ll find multiple references to Baldur’s Gate 3, first as the name of the PNG file of the logo, then as a copyright notice attributed Dungeons & Dragons owner Wizards of the Coast. The details were dug up by kunken on Twitter.