Sony Ericsson has just announced the availability of the first official Android 4.0 Ice Cream Sandwich firmware for three SE Xperia phones namely Xperia arc S, Xperia ray and Xperia neo V. However this ICS Android 4.0 ROM is an alpha release ROM and you should only try it if you have the knowledge of unlock boot loader service and know what you are doing. Download link of the firmware and other details after the break.
Download Sony Ericsson Xperia Android 4.0 ICS Firmware
Xperia arc S Android 4.0 ICS firmware download link
Xperia neo V Android 4.0 ICS download link
Xperia ray Android 4.0 ICS download link
Filesize of Official ICS ROM: 133MB, just accept the alpha release EULA for instant direct download.
Official release article at developer.sonyericsson.com