The user who published the video notes in the description that the Xperia Z2 in shot isn't running final software as it's still in testing - although there's no way of verifying this information.
There isn't anything particularly groundbreaking shown in the video, but it does appear that the handset is running Android KitKat, with the wallpaper continuing behind the on screen navigation buttons - a feature which arrived with version 4.4.
According to the network information on the lockscreen the phone has an EE SIM in it - suggesting the handset is in the UK. Take a look at the weather widget and the location stated is Coventry - England it is then.
An icon on the homescreen says "4K", while a 4K recording option resides in the camera app, reinforcing rumors that the Xperia Z2 will be able to record video in Ultra HD.
Interestingly, the phone in the video says it has 36% battery left, yet the battery widget on the homescreen quotes "1 day 2 hours" life remaining - could the Xperia Z2 have a super juice pack inside?
TechRadar will be reporting live from MWC 2014 to bring you all the latest from the show, including any products Sony may launch.
- Check out our Android 4.4 KitKat review