• Ditching the optical media for longer battery life
• 4 cores in the 13"
• Max RAM of 12 GB (this one isn't listed ... maybe?)
• The higher resolution 1440x900 resolution in the 13" that the Macbook Air has
Altogether it's a pretty wussy update. Basically it looks like the diff (on the 13" model, which is what I care about) is:
• Faster CPU (finally!)
• Thunderbolt port (count on buying another $30 display adapter like every generation)
• 3 hours less battery life