There's no title for this, but the teaser clip certainly does look rather Minecraft-esque, no?
The teaser's site URL ends with "hakoniwa", which means "box garden" in English. Perhaps Hako Niwa is the title of this building block game?
No word yet on the platform. Or platforms. The site's URL also has the word "consumer", which in Japanese video game lingo refers to home or portable hardware and not mobile.