Here's a list of (small yet noticeable) differences I've compiled for the new MacBook Air in no specific order:
Hope this helps! If you notice some more minor differences, please post!
- The SSD unit is a mini-PCIe card instead of a standard 1.8" SATA unit.
- No backlit keyboard.
- IR sensor and sleep light have been omitted.
- 11" has reduced size function keys.
- Power button is no longer aluminum and takes the place of eject key.
- Last row of keys on 11" are of same height as alphanumeric keys; the last row of keys on the 13" are slightly taller than its alphanumeric keys.
- 11" uses ultra-low-voltage processors. 13" still uses low-voltage processors.
- Stereo speakers in both models.
- Lower operating temps and fan speeds.
Hope this helps! If you notice some more minor differences, please post!