I think Apple will most likely release a 5th gen iPad in the fall which will be completely renovated (design + hardware + features). Also, the 6x processor is more than powerful enough in the 4th gen ipad. There's no reason to update that so quickly. Another consideration is Apple must wait for technologies/components to mature i.e.screens, batteries etc. Not enough innovations in current hardware have occurred to release a completely renovated iPad. I could be wrong. And if so, I'll be looking forward to a 5th gen iPad in the near future (summer vs fall). Again, my guess is in the fall (September). The iPhone 5s will update (summer) to most of the current tech the Galaxy S-IV is sporting. The iPad, there's nothing to really compete again in my own opinion. The only new suggestion would be form factor and I think Apple will want to wait on more mature technologies before it can do much more with the current form factor.
I think most of us will be wowed again with the release of the 5th gen iPad. No reason to rush it given the current market.