According to Evan Blass (@evleaks), this handset is currently known as Sony Xperia PP10. Of course, "PP10" doesn't sound like a moniker that Sony would actually use to market a smartphone, so we're expecting it to have a proper name once it's released.
Unfortunately, at the moment, there are absolutely no details on the specs of this Xperia PP10. However, we're guessing that this is a mid-range device (possibly a successor to the Xperia M5), although, of course, we might be wrong. In any case, we can see that the handset features a dedicated camera button next to the volume rocker and the power button. Also included are dual front-facing speakers, and the usual rear and front cameras. It seems that the device is partially made out of metal - but, again, we could be wrong.
We'll let you know more about this Sony Xperia PP10 as soon as we have new details.