LEGO has an official press release about this, which various sites are already discussing - shows a trailer and release window (late 2018):
https://www.lego.com/en-us/aboutus/news-room/2018/september/lego-cube-tencent-2018/
... But there's much more to be found on Chinese news sites. Running them though Google Translate gives rough, but overall good enough results - it seems the game's Chinese name translates as LEGO Unlimited.
No word on if there's plans to release it outside of China, as far as I can tell.
http://news.17173.com/content/09192018/190440738.shtml
Contains some (low quality) gameplay footage, and other details:
https://www.gamersky.com/news/201809/1102213.shtml
This article has several pages of screenshots (or, rather, photos of a mobile device running the game). Note the screenshots showing what appears to be a crafting system, weapons/tools that have meters implying they degrade and break, and the player holding blocks consisting of a 2x2 plate + brick + plate. It seems the terrain is made of these 2x2 cube-ish assemblies, and even appears to have ore that can be mined, and trees that can be chopped down - altogether very Minecraft-esque. There's also a very LEGO Worlds style building tool.
https://www.taptap.com/app/82246
Some more promotional images, and again mentioning the iOS/Android/PC platforms.
http://games.sina.com.cn/t/n/2018-09-19/fxeuwwr6126206.shtml
This article mentions "Players can now make reservations through the official website."
http://www.sohu.com/a/254860271_116903
More promotional images, details:
https://www.prnasia.com/story/223299-1.shtml
Not much in this article, but here it is anyway.
And finally, the game's official website:
https://lgwx.qq.com/index_p.shtml