“Even though a lot of the basic functionality of this ICS beta ROM is working, you should only download and install the beta version if you are an advanced developer. This is not the final software, and the stability of the software may not be ideal as it has not been finally tested and bugfixed.”
“You must acknowledge that the software is provided “as is” without warranty of any kind, expressed or implied, and to the maximum extent permitted by applicable law.”Also, if you unlock the boot loader, you will not be able to download and install the final Ice Cream Sandwich software upgrade for Xperia™ phones.
So those of you who can deal with the shortcomings of a beta ROM and want to go through the hassle of the manual installation, hit the source link below for the files and instructions on how to do so. Let us know how it goes!