Sorry Bro..There is no way to get ICS BETA on locked bootloaders..atleast,not yet.
If you cant unlock your bootloader then it would be better to wait for the official release..
If you can't unlock the bootloader because of operator restrictions omnius may be the way to go.
If you can't figure out the unlocking process, you should be careful. Flashing things on your phone and installing beta ROMs can cause many problems far more difficult than unlocking the bootloader.
I say this from experience cos I don't know much about Android and I've dug many holes for myself in the learning process. Good luck