According to Blog of Mobile, an Xperia Canopus made for KDDI au (Japan’s second largest mobile operator) was certified by Japanese authorities recently, carrying the model number PM-0750-BV. The blog - which usually provides reliable info - reports that KDDI’s Canopus features LTE, WiMAX, Wi-Fi 802.11 a/b/g/n/ac, a quad-core Snapdragon 800 MSM-8974-AB processor, and an unspecified version of Android. It further notes that the handset’s screen could measure 5 inches, and KDDI au will likely launch it as the Xperia SOL25 (which would make sense, because the Xperia Z1 is currently sold by the carrier as the SOL23).
Another Japanese blog lists the SOL25 as being the “Xperia Z2”, and even shows a concept design based on the rumors surrounding it. Here it is (keep in mind that this is not a real device, just a fan's dream):
We have no idea if the Sony Xperia Canopus / PM-0750-BV / SOL25 will look like this, but it’s certainly a nice design (with the screen bezel thinner than on any other Xperia). We also can’t know if this handset is the Xperia Z2. But its recent certification could mean that Sony is almost ready to officially announce it. MWC 2014 is almost around the corner, so perhaps we’ll see both the Canopus and the Sirius (which may have a larger 5.2-inch screen) then.
sources: Blog of Mobile (translated), FXtec (translated)