From the official site:
"The New Arrowhead" will give fans a greater variety of experiences beyond the on-field action. Stadium improvements include concourses that will be nearly doubled in size, allowing fans to get to their seats – and back to the action on the field – in less time; more restrooms; a greater variety of food and beverages to enjoy; a broad range of bars, concessions and seating areas within the concourses; and club lounge spaces to enjoy with family and friends.
Meh. I only care about "on-field" action and not about more ways to squeeze a dollar out of a Chiefs fan in the stadium. Comparison of the old and new stadium after the jump...
Other additions will feature an upgraded sound system, new video board displays - including a 360 degree ribbon board around the lower fascia of the stadium - a new press box, and a new group seating area - the Horizon Level.