Some sources informed that Xiaomi will present their new phone on MWC 2018. Nearly everyone thought that we will see there Xiaomi Mi7, but it looks that we will have to wait for presentation of this phone, because Xiaomi doesn't plan presentation of Xiaomi Mi7 on MWC 2018. This information doesn't mean that we won't see on this event new phone of Xiaomi's production, because there's a lot of probability that on MWC 2018 we will see Xiaomi Mi Mix 2S which will be updated version of phone from the previous year.
We don't have any confirmed information about specification of Xiaomi Mi7, but it's rumored that it will have 5,65-inch display with FullHD+ resolution, Qualcomm Snapdragon 845 processor, 8GB of RAM and dual camera setup on back with two 16mpx sensors.