On March 16, the third generation iPad was released for sale in the United States. Apple is calling it Resolutionary. The amount of pixels packed into the display is simply amazing: 2048×1536. 3.1 million pixels — in a 9.7-inch display.
With great resolution comes great responsibility.
Responsive Web Design or Progressive Enhancement.
Both terms have the same goal in mind.
Responsive Design / Progressive Enhancement has one goal: provide a universal, future-proof, device independent experience.
Anything beyond that is speculation on approach, resources, and implementation; techniques to achieve the goal.