AnandTech has built a comparison table showing, in detail, the small technical differences between the previous and current generation MacBook, MacBook Pro, and the MacBook Air.
Aside from the CPU and hard disk storage options, there is really very little difference between the old MacBooks and the new ones announced on Tuesday. Of course, benchmarks for the CPU performance and battery life are sure to be published soon as customers take delivery of the new notebooks.
Here is the comparison table worthy of a bookmark.