Sony are going to expand their Xperia line in the near future with the Xperia ZR, which is set to step in the footsteps of the Xperia Z. While the Xperia Z has a 5-inch screen, the Xperia ZR will arrive slightly shrunken down at 4.6 inches.
We should see the same water-resistant goodness backed up with dust resistance, as well as the same quad-core Snapdragon S4 processor from Qualcomm. Sony have said that the Xperia ZR can be left underwater for up to 30 minutes at a depth of 4 feet. This is where the dedicated camera button comes in handy, where an owner of the Xperia ZR can press the button while their phone is underwater - if this is something they choose to do.
The Sony Xperia ZR will arrive in four colors: black, white, pink and mint. It'll be available later this quarter, with pricing to be announced soon.