https://www.techradar.com/news/leak-suggests-xiaomi-mi-7-will-have-an-iphone-x-like-notch-design

Xiaomi recently confirmed the Mi Mix 2S to debut on 27 March. It has now been followed up by a leak from an industry insider, Mocha RQ, who claims that the Mi 7 will be launched in June. Further in his leak, he shared some new insights about the phone. 

Mocha RQ has speculated that the Mi 7 will be announced in June and the reason for the delay, as he states, is the complications in fitting the in-screen fingerprint sensor on the phone.