A new vivo smartphone has been spotted on the website of Indonesia’s certification agency. While the data doesn't exactly reveal the name of the device, the specs included in the listing strongly suggest it's the vivo X9.
There's currently no information on exactly when the phone will be available in Indonesia (and other markets), and what price tag it would carry. For reference, the device starts at RMB 2,798 (around $405) in China.
In some website they did a comparison of V5 Plus and X9 and the specs looked different. So I'm not sure if V5 plus in other markets is equivalent to the phone called X9 in China.