It appears the Xperia Z isn't Sony's last hurrah for 2013, with the Xperia A making an appearance in seeking approval from the US Federal Communications Commission (FCC). The phone boasts a 5-inch screen which is 1080p as you would expect. 

It also features a 2,300 mAh removable battery and uses the 13-megapixel camera from the Xperia Z. You also get LTE connectivity and 16GB of internal storage. We're not yet sure what sort of processor will be inside, although expect it to be a quad-core of some kind, possibly even a Snapdragon S4 Pro.

Read: Sony Xperia Z review

The filing with the FCC lists the phone as NTT DoCoMo's SO-04E, which means it is likely heading to Japanese phone networks first. If that is the case, it could appear on 15 May when DoCoMo unveils its Summer handset line-up. 

Sony has done a good job with its handsets in 2013 so far. It pipped the competition to the post with the Xperia Z, which has now been slightly overshadowed by the HTC One and Samsung Galaxy S4. Expect this new Xperia A to shift the limelight back in its direction.