I think the newer one should give better battery life thanks to Broadwell and more efficient graphics, and if I'm not mistaken the new PCIe flash storage is faster.
So while the processor isn't quite as powerful in some regards, it should be better overall for you. I suspect they aren't all that different, though.
Like an extra hour with battery?
Because if I go from my actual MBA to the new one, I will go from Intel HD Graphics 5000 to 6000, I will get half my flash storage 512GB to 256GB and 1.7GHz dual-core Intel Core i7 (Turbo Boost up to 3.3GHz) to 1.6GHz Dual-Core Intel Core i5 (Turbo Boost up to 2.7GHz)..
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