I think there will definitely be a 16GB RAM option next year. Perhaps even this year with Haswell. And by next year, there will probably be IGZO and quad-core.
That said, how are you going to live with the 4th-gen iPad?
I remember when it came out last year, I already knew the 5th-gen would be much lighter/thinner like the Mini is. The one out now is outdated in terms of design, IMO.
Yeah, most likely there will be a 16 GB RAM option next year, but I didn't want someone to say "How can you be so sure?" When I got the 4th-Gen iPad last year, it was my first introduction into the Apple ecosystem. I had ever owned an Apple product before, (not counting my 2nd Gen iPod touch my cousin gave me after he bought the iPhone 4 unlocked, which he later lost) and I didn't really want to wait another year to buy one. As well, I had already decided on buying an iPad when the Mini came out, and it was too late to change my mind by then. It does it's job well, but it's not hard to see it's limitations. Also, my mother will get a new computer, as her current computer has slowed down so much that she refuses to use it.