It's potentially very bright because it's going to pass quite close to the sun, in late 2013. Such predictions in the past have proved quite unreliable; some are bright, some are not. The actual brightness depends on a lot of factors, only one of which is how close it appears to the sun. Another critical factor: how many times it's been close to the sun before (which determines how much volatile material is left in the comet).
But...if they're right, and this comet really is brighter than the full moon, then it will almost certainly be the brightest comet in the history of humankind. That will make it quite an event to see!
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