There is root, but it's under lock and key until ICS is officially released. I don't even have a copy of the exploit myself as I don't want it being public yet. I'd rather wait it out so that it doesn't get patched before ICS is really here.
Best thing I could suggest is trying to use root methods for as many ICS methods you can find that don't involve flashing custom software. Also, be aware, that if you do it wrong, you will soft brick your phone as LG has added a lot of security to the leaked .tot file and put up security warnings if you remove the wrong files (even the music player).