I still don't feel that the difference between the iPad 2 (which I own) and the iPad 4 (or whatever you want to call the current gen) is as significant as the jump between the iPad 1 and the iPad 2. The 1 to 2 jump literally felt like a reasonable upgrade all around. I've had the opportunity to use a current gen iPad at length and while the display is nice, I'm personally holding out for the next or even the next-next model. I'm not a power user by any means; I play games, surf the net, work on documents/spreadsheets,etc. So, until I feel like the upgrade is worth the $400+ or until the iPad 2 is app-wise kicked to the curb, I'm content waiting.
You make several valid points, and as far as what I use my ipad 4 for, it's pretty much the same as you; casual web browsing and some games here and there.
But I'm not sure what everyone is expecting in the "new-new" ipad. Considering Retina is practically "super-HD", and that's what next gen game consoles are aiming for...I doubt you see any improvement over the Retina screen for a good while. Which is fine, because current gen Apple specs/hardware already trump anything Android sends out.
Next big step for Apple will probably be a Retina mini, and even then, it'll pretty much be the same specs as the ipad 4, just in a smaller version...which some may like more, while others don't because they prefer a larger display. So even then, the retina mini won't be 100% confirmed to be "better" than the ipad 4.
I think everyone watches too many movies and expects the new ipad, game console, phone, WHATEVER it may be, to be like Tony Stark's devices in Iron Man with the futuristic in-air layout and see-through plexi glass, etc. I think it'll be some time before anything like that hits shelves and even then, you better have a Tony Stark spending budget...