I just need to hold out until the end of Friday. Resist the temptation until that date and I won't be able to return the Air (the 14 days would have passed) so that'll prevent me from getting the Pro.
Ask yourself this, what am I going to use if I return the Air until the Pro is released? Can you hold out? If so, try the Pro down the road and if it is overkill for your needs just return it and buy an iPad Air 2 again.
You may not be able to live without the Pro so you didn't lose out and will be happy you tried it and returned the Air.