As usual there are rumors that tell us all we need to know about Apple's plans!
The major one now is that the current iPad will get the treatment the iPad2 got, with a 32 nm shrink of the A5x SoC. if that occurs, and Apple leaves the battery alone, which would be the simplest thing to do, then we will see drastically longer battery life.
But some thought is that Apple will slash the battery somewhat, thin the case, make it lighter, and give that instead.
There is even the thought that the IZGO display is finally ready, which would allow a less bright, less expensive, and less power guzzling backlight.
But these are just rumors, of course.
As for the next iPad, I do think that we'll see the A6x. Same CPU, newer more powerful GPU from the new Imagination 6000 family, I think it is, and a higher clock.
If the new display doesn't turn up on the present model, and I don't think it will, as that would practically make it a new iPad, and leave less for the next model, then it WILL show up in the new one, assuming that Sharp, and others get it right, finally.
Maybe 2GB RAM? We're seeing that on a couple new Android models. They do need a lot more memory than iOS, because of the multitasking model they use.
Only improvements iPad really needs as far as hardware, is thinner, lighter, more efficient. I don't think the Tablet market has the same crazy demands as the smartphone market.