I'm actually really surprised how many people think next week's iPad is going to be an all new form factor with rounded edges.
Potential part leaks we've seen have shown the chamfered edges with just a couple minor minor changes like the recessed buttons, and in recent years Apple has been on a two year design cycle for iOS devices, plus in very recent years the iPad designs tend to lag the iPhone designs by one year.
Unfortunately I think we are getting a chamfered edge, 1 GB RAM iPad Air 2 this year. I love the hell out of my iPad 4 and was going to upgrade to a 2 GB RAM Air 2, but at this point knowing the next iPad will have the rounded glass almost makes me interested in waiting til next year, at which point I would also certainly expect 2 GB of RAM. We will see what Apple releases next week though, but in the meantime I love my 4.