Hi all. For WordPress 3.5, we've decided to add HiDPI ("retina") theme screenshot support. Turns out, all we need here is a change in the guideline. Rather than recommending 300x225, themes should start using an image that is 600x450. Same 4:3 W:H ratio, just doubled.<div>
<br></div><div>This would *not* be a new screenshot-2x.png file. Rather, the standard screenshot.png file should now be 600x450. For non-retina devices, the browser will simply scale this down. Also note that this is fully compatible with previous versions of WordPress, as we have *always* placed height and width limitations on the screenshot via CSS. So you can start doing this now, and it will look good in 3.4.</div>
<div><br></div><div>An aside, it would be pretty cool if Theme Check checked dimensions of screenshot.png (if it does not already).</div><div><br></div><div>Nacin</div>