If you have a really keen eye, then you'll probably notice the subtle exterior updates to Nissan's line of 2010 sedans -- the Altima, Maxima, Sentra, and Versa. For the average bystander, though, these four-doors will scoot past with little reaction. Perhaps a, "Hmm, there's something different about that Nissan," but not much more. Ditto for the freshened interiors, all of which get minor tweaks, mostly with the electronics (audio and nav) and gauge clusters. Not that these changes aren't welcome and noteworthy, mind you; they've all been implemented to improve aesthetics and functionality, and to that end, they all succeed. Below is a rundown of the subtle but significant updates to Nissan's 2010 sedans.