After the launch of Vivo’s X100 series in China, which includes the Vivo X100 and Vivo X100 Pro smartphones, Vivo now seems to be gearing up to launch two more phones as a part of its X100 lineup. While we have been hearing about the expected launch of the Vivo X100 Pro+ (also tagged as the Vivo X100 Ultra), it now seems that Vivo may also planning to announce a new Vivo X100s model. There was not much known about this mystery handset until a…