The great thing about open source software is that anyone can contribute to the codebase, once it’s available on the official distro 
AFAIK @dimalo doesn’t have the device for testing purposes, and is pretty busy at the moment.
For anyone willing to add support to the new temperature sensor - take a look at this folder.
XiaomiSensorHtHandler.java is a handler for humidity and temperature sensor. Something similar (probably extension of that class?) would apply to the new weather.1 channel.
Cheers!