The 4K video alone is worth the upgrade. The display is a newer panel. IPad Pro A9X although lower clock speeds. The speakers are now 4x. The LTE bands are now supported (Band 12) - and LTE Advanced supported. Aside from these new hardware updates, the only thing they gimped on is the USB 2.0 interface.
Other than those things it's a much better iPad than the IPad AIR 2.
While I agree, it'll be an update to the Air2, 'much better' (I've got the Air2, trying hard not to be impulsive, as we've also got the iPP

) may be subjective, and a bit - well, let's just say that Air2's still a righteous weapon in th hands of her owner

{you're right, for a couple reasons you named, the display... And the 4x speakers you mention, they're a phenomenal addition to the iPP, actually 'usable' and functional!}
Performance on my Air 2 hasn't really been an issue either. I suppose the reasoning for me might be to have newer features like Hey Siri, improved display, faster CPU and graphics, 4 speakers. I'm not really sure I'd ever use the pencil though or the keyboard for that matter.
You've got 'Hey Siri' on your Air2. D/L the 9.3 update ...if you've not yet [if you've not, you don't yet

, will soon]
This is the best iPad ever made. It is better in every conceivable way to iPad Air 2. It should be a nobrainer upgrade for everyone.
? Huh ? --
I am interested in reading the reviews to check if this complaint for Air 2 is in the past:
https://discussions.apple.com/thread/6738006?tstart=0
I remember that was THE reason for me not having bought the Air 2 at the time and replacing my old 4th generation model.
Since all iPADs are imported here, the final price is going to be REALLY EXPENSIVE....
.....For me, aside from all other improvements already discussed, I am particularly interested in it for being thinner and lighter.
Really? A page and a ½ of folks mainly calling out, disagreeing completely, and begging for some evidence from the OP about a true 'non, never was an -issue? Yikes, the last 18 months could've been a more enjoyable period without such depth of speculation bro! If it's broken, they'll fix and/or return your cash!
Air 2 still has low memory issues. Hopefully this has the higher amount of ram that the big Pro does.
Now we're getting silly and I will shut up
A) I own the Air 2, your statement is patently false and
B) I own/am aware of the fact the 'big Big Pro' has = 4GB (2 in Air 2)
C) Why it's silly. It won't have >4GB of RAM. IF you need 8GB, buy yerself a 'puter bro!
Crazy. Silly silly peeps.
Today's iPad announcement was killer and as an Air 2 owner I'll have to practice restraint. I'm 45 this year and I've never been good at iOS restraint
Wish me luck.

& 2 all that do buy one, good call
As an iPad Pro owner since November, I can honestly say that the speakers alone will blow your mind. Anything that improves the display, as it's what the iPad 'is' ...is a Big Deal and self calibration along with Night Shift which I've enjoyed through the public beta, are game changers. If there's 4GG of RAM on the 9X, this is a helluva tablet ...as Phil (I believe? Now not sure who said the line ...think Schiller though) said, "the best invention Apple has made, The 'Pencil''.
He's correct. I'm addicted to my Pencil and you can forget the keyboard. The former, mandatory.