Now, as for the 2013, it's still an uncomfirmed rumor or logical guess as to urea coming to the pickups. Nothing has been announced. As to the good/bad? I'm still on the fence; the Ford and GM guys seem split themselves, some say it's a big improvement, some don't see much if any improvement, and some have problems with it.
Would I be scared to buy a 2013 with urea? No. And if it was really that bad, I'd delete it all. I'm still fully against all the emissions crap they saddled these trucks with