I was thinking that polarizing the hull might do something to actually reinforce the material in the hull, making the plates themselves more resilient.
But it's more likely that it'd just help with deflecting charged particle weapons.
We might have a better idea when Paramount actually opens up the "Tour Of The Ship" part of the Enterprise page on startrek.com.
"Ah, those are the days - I figured I'd get some caffeine in me and restart my brain, instead it blue screened. Man, that's the last time I buy my brain from Microsoft."
--Largo, weekly rant 01Feb2001, Megatokyo