ICS Upgrade for Rooted Xperia S

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http://forum.xda-developers.com – Hi, I'm fairly new with this phone, and I had rooted it without unlocking the bootloader. (downgrade to GB, root, then upgrade to ICS) I just found out that a newer version of ICS is released the other day and was wondering that if there is anyway I can update my device while keeping the root ? Say, if I use flashtool to flash the new version, will I lose the root? Or should I use the pc companion software? Or cwm recovery? I am a total noob here, and I have no idea what I'm doing... Kind of want to figure everything out before I accidentally bricked my phone. (HowTos)