I honestly don't get what the hype is for the ipad5... The ipad 4 has retina display, great brain and ram with the amazing lightning dock.... What can the 5 offer? Apart from a new look
They need to release ipad mini 2 in all honesty
The one killer feature for iPad 5 won't be the new design (which I'm convinced is coming now if only because Apple introduced edge swipe gestures to the base OS & they work best with thin bezel) but the reduced weight that goes with it. Right now the compromise to run a retina display at what Apple consider acceptable performance levels is the need for a huge and heavy battery pack for the screen and CPU/GPU. Only real way to do a mini-style design is to cut power requirements to allow the same run time on a smaller and lighter battery pack (or increase the capacity of the packs to fit into the smaller space which would have, more or less, the same effect).
There's also still the problem of GPU. The 4 is an improvement over the 3 but both are still pushing what the silicon can do. Ultimately Apple need PowerVR 6 (Rogue) chips to really make the most out of the display on the iPad and that should be available in time for the 5 if the rumours are right. Even if Rogue only manages 75% of what they're claiming it'd be a huge jump forward from the current GPU cores. What's interesting is that Rogue is also supposed to be at least decent at GPU Compute (offshoring calculations from CPU to GPU) which could offer Apple some new options particularly in photography or video apps.
BTW the same problems apply to the iPad Mini only reversed. In that case Apple took the other compromise focusing on form over the function of a Retina display (likely because they physically couldn't do a retina display in that size/weight of device). If they've cracked the problem for the 5 to let it shrink down and go on a diet the same tech could likely go into the mini and enable the use of a Retina display, albeit maybe slightly cut down from big brother (so, say, a 2 core GPU instead of 4).