If you were thinking that the Vivo X21 has good chances to arrive with a Mediatek Helio P60 then that’s just not going to happen. Qualcomm China posted a photo on Weibo that confirms that the X21 will be using a Snapdragon SOC again this time. However, this time it may come with a Brand new one which is not available in the market right now.
The reason why a new Snapdragon SOC can definitely be a thing is that, the X20 Plus UD came with a Snapdragon 660 & the X21 should bring an update to that. So, it might be the Snapdragon 670 or one of the new Snapdragon 700 series SOCs. However, the improvement in raw CPU power can be significant at this point.
The Vivo X21 will be announced on 19th March in China. However, availability outside China is still a question.