With a forward tilt to the grille and an upward, inward point to the headlights, grille and bumper the new heavy-duty nose looks like a stout blunt instrument, rather like the point on an anvil.   This is Dodge's in-your-face styling with a bigger face and broader shoulders.  

While the style and lights are from the 1500 only the latter are the same parts.   The HD's grille is larger to allow more cooling air in, the bumper is reshaped, and the hood has a larger central bulge and faux louver contouring, but the easiest way to distinguish the HD from the 1500 is the gap between the bumper and everything above it; the 1500 has no such gap.  

Also new for 2010 is an HD crew cab, the same size that debuted on the Ram 1500 and a closer match to competitor crew cabs.   Dodge's crew replaces the Quad Cab, and the ultra-long Mega Cab is back and uses the same rear doors as the crew.  

However, the Mega Cab does not get its own bed size, the 6-foot, 4-inch box also offered behind the crew cab.   It doesn't look that long behind the imposing Mega Cab but it is; you can not get a Mega Cab long-bed as it would be a bit unwieldy anywhere outside the great plains.  

Dual-rear wheel trucks, including the Mega Cab use a single outside panel for the wide rear fenders, to eliminate seams and fasteners that might prove problematic long term.   And the bed sides are steel, for easier straightening than fiberglass if you ding one.  

The Dodge slots between the GM and Ford HD pickups in terms of sheer mass and sleekness; perceptively bigger and more angular than the GM and smoother than the Super Duty.   Very mild fender flares or various colors are used on some trims, and the Power Wagon gets a new graphics package and flat, dark paint for the center of the hood.  

Roof clearance lamps, government-mandated for vehicles like dual-rear-wheel pickups that exceed a certain width, now use clear lenses for a better-integrated look.   Upper trim level mirrors get puddle lamps, and the flip-up towing mirrors get turn signal repeaters and a separately adjustable, much larger wide-angle element at the bottom (in tow position); in the retraced position the outboard wide-angle element is very useful in traffic and tight parking areas as you can view both rear tires.   Worth noting, you can adjust the electric mirrors without having the truck switched on.  

A tailgate lock is standard, as is assist so it can be opened and closed with one hand.   On trucks with backup cameras, the lens is far enough from the latch so you won't scratch it opening the gate, and it gets decent protection and snow/ice rejection from the tailgate's upper lip.   Bed rails are protected from load scuffing, and the bed is contoured for 2x4s and 2x6s to make it dual-level.  

On trucks with satellite service for audio or navigation the antenna is on the right rear of the roof.   It should be safe from contact with contractor racks or cabover campers but those pieces, or their contents, may well block the antenna's ability to receive signals.