As far as the specs, the Xperia ZR will have a 4.6-inch (720 x 1280) display, a 1.5GHz quad-core Qualcomm S4 Pro chipset (we’re hoping it is the newer 600 series), 2GB RAM, a 13MP Exmor RS camera sensor, 8GB internal storage, microSD memory card support and a 2300mAh battery. The Xperia ZR will also be water resistant with an IP55/IP58 rating, giving it a higher level of element resistance than the Xperia Z. With that rating it can be submerged in much as 1.5 meters of water for 30 minutes.
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When it comes to looks, sources say the design of the handset looks more like the Xperia ZL than the Xperia Z with its glass body, however it will be pretty thick (about 10mm and weighing around 140g.)
So far we have no details on price or release dates. As always, we will make sure to update you as soon as we receive pictures and more details.
Source: Xperia Blog