Sony Xperia Ion owners can now rejoice as their device can now be rooted. XDA-Developers forum member yuunanase has released a method that allows the LT28i to be rooted with minimal effort. It requires you to unlock your bootloader and then flash an insecure kernel. To complete the process, you will need to run a small script and finally, install the Busybox and SuperUser applications from the Google Play store.
If you are unsure about flashing an insecure kernel, be assured that yuunanase is working on an alternate method of rooting the phone. You can find the full thread here