Among the recent whirlwind of mid-size sedan updates—including the 2012 Toyota Camry and the forthcoming 2013 Chevrolet Malibu—you might have forgotten about one of the group’s elders, the Nissan Altima. Right on cue, then, arrives this heavily camo’d prototype of the next-generation model, which should go on sale for the 2013 model year.
It’s hard to determine much about
