I'm sick of apps restarting (when multitasking) and tabs reloading in Safari (when surfing), both of which are due to limited RAM. Besides, I need more space and cellular too.
Someone said it would "probably" come in April, then in May, then in June and now in... September? I have waited patiently for the 5 (or mini 2) since February/March, but it might take many more months since we haven't seen any proper leaks yet (well, at least I haven't).
My plan is to get the 4 tomorrow or in the weekend. Then I'll still have time to sell my iPad 2 (16 GB WiFi) before the iPad 5 gets announced.
To be honest the sensible money has always been on September / October and I think now more than ever that's the likely introduction of the iPad 5. Couple of reasons:
1) New version of iOS. iOS7 will be ready and considering the scale of the redesign I can't believe Apple would want to launch it on year old hardware. There's some other reasons around that which are a little fuzzier, things like the increased focus on swiping from the edge of the screen which work better with a thin bezel or that parallax depth effect feeling better on thinner devices, but if ever there was a time to push a redesigned iPad that'd be it.
2) Availability of GPU. This is the big technical reason and it comes down to the new PowerVR Series 6 Rogue chips. They've been in development for a while and promise a big (dare I say huge) jump in performance as well as opening up GPU compute to the iPad. It's supposed to be available in Q3 2013, so anytime from around July onwards, and frankly it's something Apple really need at this point. The upgraded GPU in the iPad 4 helped with performance on the retina display but it's still not quite where it should be and Rogue ought to give them a proper generational leap.
And while I wouldn't say it was required I can't believe Apple want to go too much further with the current iPad design. It's hardly a chore to carry and use but the compromises to get a Retina display in 2012 are fairly obvious. Looking at what should (note: should) be available to them now it's not hard to believe they can really hammer down power consumption and deliver a considerably smaller device as a result that's more in line with the rest of the iOS family.