If updating from previous release of this ROM, you only have to wipe dalvik-chache, but I forgot it a few times and nothing happened. So you can't really mess things up, just make sure to do a backup from recovery first.
I know it's a little OT but seems that Android Jelly-Bean will be 4.1 e will be out soon. http://www.theverge.com/2012/6/21/31...bean-confirmed
Maybe it's not soooo incredibly different from ICS and we can have some kind unofficial porting of CM 10 next year, who knows.of
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