The Sony Xperia Z isn't due to be available globally until the end of the month, but being the good, GPL-abiding OEM that it is, Sony Mobile has already published the device's kernel source code. The code, which will only really be of use to custom ROM developers, weighs in at 203MB, and can be found at the Sony open-source archive linked below.
With the phone as yet unavailable for those outside Japan, we doubt there'll be too much development activity going on over the next couple of weeks. But it doesn't hurt to have code ready and waiting for when devices start to make their way out -- especially as so many manufacturers lag behind with their open-source duties.
For more on the Xperia Z, check out our hands-on coverage from CES 2013.