Vivo’s X Flip has shown up in numerous leaks and rumours over the past few months. But there’s still no sign of an official launch apart from rumours that claim that the foldable will be launched in the coming weeks in the company’s home market, China. The device will be the company’s first vertical folding smartphone and apart from its inner folding display, it is also rumoured to feature Zeiss-branded rear-facing cameras, like on the recent…