What only 6 more months to wait? I'd say wait but why. My ipad air is pretty much perfect. Lightening fast. Aside form the occasional crash perfect. But that is software based probs so it will likely happen with either device.
Let's see the new one will have a i8 chip (can't get much faster), if higher res it's lost on your human eyes, will get a finger print scanner home button which is nice, won't get near field pay as iPhone will get that first, won't get any thinner. The only reason I would upgrade come time is if they increase the size. But I'm guessing that won't happen this time around. But apple does feel like they are getting a little stagnet. Which means it's near time for them to come up with something mind blowing. And the watch is not mind blowing.
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You can always look at tit like this. Buy the air now. Use it for 6 months. Sell it at a loss of 50 to 100 bucks. And buy the air 2. So you just spent 50 bucks to have it now. Worth it.
I don't care about the fingerprint scanner. It's the A8 chip I care about.