This is correct.
The way Apple implements their retina display iPhone and presumably next iPad is not the same as how a large monitor implements a high resolution. An iPad with 2048x1536 pixel resolution is not the same as your large monitor with 2048x1536 resolution. That iPad is still effectively just 1024x768 screen resolution, but it uses 4 pixels per point so that what you have traditionally thought of as a pixel is rendered more sharply.
All existing web content is automatically and instantly fully compatible with a retina display. In fact, it would look absolutely identical in every regard except that Safari will enhance the fonts (and other webs styling elements) for you to take advantage of the additional sharpness. Static content, like images, will automatically be doubled so that they appear the same size, relative to neighboring fonts and elements, that they do on non-retina displays. But to your eyebals, they will look identical on either screen. They don't get pixelated or distorted; anyone thinking that doesn't understand that the only reason that happens on your monitor is because you're also increasing the real-world size of that image, and that helps your eyes more easily see the pixels (which you would then think is blocky).
