For the iPad 5 I would like to see Apple go to three models for the ipad: mini standard and Pro
Key feature I want in the Pro is full A4 Sized screen (better performance and battery life would be nice too)
I currrently use my iPad to hold pdf versions of documents so I don't have to as many papers when I travel (which I do a lot)
Problem is that the current screen cannot render an A4 Page adequately. If I display a full page on the screen the text is too small for my 54 yr old eyes (even with specs) and if I render it full size I have to scroll to see the full page neither is a good option. (particularly for documents containing tables formatted for an A4 page)
Just like ibook pro users who pay for the extra ports, processor speed etc I would pay for a bigger screen. I suspect I am not alone.
Given I normally carry a portfolio with the ipad and some papers in it now the additional size would not be a problem. Also more screen real estate would be nice for browsing on the sofa.
Not everyone wants the smallest device possible.
I'm with you! But, I very much doubt that this will ever come to pass. First of all, I don't think there are that many of us reading a lot of PDFs on the iPad (or reading much at all, to be honest). Second, the larger size would make a mess of apps, which are already suffering from having to design for three screen sizes.
I am really keen on Android's aspect ratio, because it enables Asian text to be enlarged and read quite easily (vertical). Unfortunately, this also results in PDFs getting squeezed on the sides for English (horizontal). There really isn't an A4 option out there for us, but I'd say the iPad's aspect ratio is one of the friendliest, and I doubt there is demand to tweak things.
To make the experience the best, you'll probably want to get a nice PDF reader (I prefer iAnnotate, but GoodReader and PDF Expert are great as well) that will enable you to easily zoom in, reduce the margins on the side, and read a PDF at almost the same size as A4.