https://www.cnet.com/news/huawei-illuminates-its-foldable-phone-in-mwc-2019-teaser-photo/

Foldable designs let manufacturers expand a handset's screen size while keeping the device compact enough to carry it the way we've become accustomed to. The radical new design is also viewed as a compelling way to encourage upgrading in a mature  market, in which we're holding onto devices longer and phone sales are slowing, along with the lure of 5G and gaming optimization.  

Of course, given the current US trade tensions with Huawei's home country of China and the company's legal woes here in the US, many of us may never get the chance to bend this particular model.