For reading novels, I can see why SOME might prefer the iPod with retina display. I have an iPhone 4 and an iPad, and I really do like the retina display and it becomes mix and match for me as to which I'll grab for reading a novel.
However, for PDF's it's no contest. The iPad's size is the overwhelming deciding factor. Now whether you buy the current iPad or wait is really up to you.
I'm really surprised you are only getting 2 hours of reading time on your current iPod. Perhaps you buy one of those external battery thingies to tied you over until the next iPad is released.
Lee
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