My predictions for Air 3
1. Design similar to iPhone 6/6S
2. Better iPad Pro like speakers
3. 30% faster A9 Chip (Compared to A8X of Air 2 and A9 of 6S)
4. IPad Pro resolution for screen.
5. Same 2 GB RAM
6. 2nd gen TouchID
7. Same camera as Air 2
8. 0.1 mm thinner than before.
9. No 3D Touch but pencil support would be there.
10. Probable: No headphone jack.
Overall a boring update for Air 2 users.