1. Not likely on the iPad, because in order to get 326 PPI on a 9.7" diagonal device, you have to pack 2530 x 1898 pixels onto it, which is 610% increase over t

1. Not likely on the iPad, because in order to get 326 PPI on a 9.7" diagonal device, you have to pack 2530 x 1898 pixels onto it, which is 610% increase over the currently shipping specs. That kind of display takes a lot of power to drive, and would perform extremely poorly compared to a similar device at 1024x768. The iPad already reportedly falls pretty flat under conditions that tax the GPU's fillrate. Sextupling the amount of work that the GPU has to do likely wouldn't do the device any favors for performance or battery life, both of which are key marketing points. Googling seems to indicate that the iPad has an A4 Mali GPU, which has a fillrate of about 100M pix/sec (by comparison, my desktop's Radeon 4850 has a fillrate of ~24 billion pix/sec). Each paint operation paints a certain number of pixels, and you'll do several of those per frame. At 1024x768 (786,432 pixels), the maximum fillrate-limited FPS to paint a one-pass single-color surface is about 127 FPS. Now, increase that to 2530x1898 (4801940 pixels) and your max FPS for the same operation drops to about 21 FPS - and that's just for painting a single color. Actually doing anything useful would utterly destroy the device. To compensate, they'd have to put in a beefier (more power-hungry) GPU. It's quite possible to build a device that would perform well at those specs, but it would be very expensive, and very difficult to fit into Apple's typical sexy form factors with any appreciable battery life. (It's been a few years since I've done high-performance graphics work, so if I'm off here, someone please correct me.)