A series of hands-on images and specs about Sony’s upcoming trio of smartphones – Xperia Z5, Z5 Compact, and Z5 Premium – leaked yesterday, and now what appears to be the original source of the info has surfaced.

A video from French website Clubic shows a hands-on demo of the Xperia Z5 Premium and Xperia Z5, conducted by a marketing executive of Sony France. It appears that the video of the pre-briefing was published accidentally ahead of the expected launch of the devices on Wednesday –  the version embedded above was somehow bootlegged and reuploaded on YouTube.

The most interesting aspect of the French-language video is the apparent confirmation of the 4K display for the Xperia Z5 Premium. Despite our strong reservations, it appears that Sony is indeed pushing the envelope of display technology with a 4K resolution on a 5.5-inch LCD panel. The Sony representative leaves no room for interpretation, calling the device “world’s first 4K smartphone.” That confirms the faint rumblings we’ve been hearing over the past weeks about a 4K version of the Xperia Z5 coming along the regular 5.2-inch Full HD model.

xperia z5 premium leak

Other specs of the three Sony devices that the video confirms are a Snapdragon 810 processor, side-mounted fingerprint sensor, battery life of up to two days, water and dust resistance (no flap for USB port), and a 23MP camera with 0.03-second autofocus. It looks like these specs will be shared across the range. The Xperia Z5 Compact is expected to feature a 4.6-inch HD display.

This video seems very solid, as leaks go, but we’ll still urge you to wait for the official announcement before reacting, one way or another. That said – 4K on a phone, how crazy is that?