Is there really a Mid 2014 13-inch Macbook Air?
The simple answer here is yes, but the mid 2014 version was ONLY a processor bump. And most importantly the cpu bump was only in the two lower end models. Not the highest end i7. 

Thus if you (like me) get the max spec cpu MacBook air, and click about this mac - it will say "mid 2013". If you get any other spec it will say 2014. 

Confused? I was too!