How are these processors different?

I purchased a MacBook Air last summer and it came with this processor,  2.0GHz Intel Dual-Core Core i7, Turbo Boost up to 3.2GHz.   The top speed processor of the newly announced MacBook Air has this processor, 1.7GHz Dual-Core Intel Core i7, Turbo Boost up to 3.3GHz.  How are they different? 
Seems the summer 2012 processor is a faster processor.  Did Apple downgrade the processor in the new MacBook Air?

The new processors are a different architecture.  They use significantly less power and offer something like a 40% improvement in graphics performance (this is probably the most significant improvement).  There would be a nominal difference in actual CPU performance regardless of the 300MHz difference.  So the new processors are actually a decent upgrade.

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