Do I think it will? No.
Do I want it to? Sure.
Am I creditable source? Not in the least.
Reasons why it might?
- High demand/Popular Feature (at least, it seems that way)
- Assuming the new MBA goes SB with no Nvidia/AMD GPU, it may be cheaper to manufacture. This would allow Apple to squeeze the backlit keyboard into the design, while still allowing them to operate in their desired profit margins.
- Maybe if battery life significantly improves, the backlit keyboard wouldn't be too much of a burden (and yes, I know you can turn it off)
- Maybe if the backlit keyboard technology improves (less power intensive, thinner design)
Reasons why it might not?
- Not enough demand/not a popular enough feature (I have no statistics)
- The design is still too thin/backlit keyboards are too thick
- Apple wants to differentiate their Pro line from their Air line
- Not having it at all guarantees longer/better battery
- Too expensive/cuts into profit margins
*I've never used a backlit keyboard before