Knowing Apple, I bet the 15 inch MBA will be $150 less than a 14 inch MBP, which comes standard with 16gb ram. The Air will not.13" MBA is 2.7 pounds (1.24 kg)
14" MBP (M2 Pro) is 3.5 pounds (1.60 kg)
16" MBP (M2 Pro) is 4.7 pounds 2.15 kg)
A 15" MBA will weigh just as much as a 14" MBP (M2 Pro), or slightly more. And dimensions will be bigger.
All the hype for this 15 inch Air will be for a Midnight color and it's called "Air". Otherwise, just buy a 14 inch Pro for a better deal for your money.