Originally Posted by berklon
If you're talking .pdf's, then yes. But .epub's wont need to be bigger to take advantage of increased resolutions of the device. It's graphics/images that increase in size to take advantage of increased screen resolution - text is text no matter what the resolution. Your current epubs will automatically look sharper on this new device.
For many of my epubs the cover takes up more space than the text already. Add a few images and the text often accounts for less than 10% of the epub filesize. The size of the cover and other images will just keep increasing as screen resolutions increases.