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The sample images are a little larger; more specifically, portrait and landscape images are resized to the same bounds. Previously, they were all clamped to 1400x1000, so portrait images were much smaller than landscape images (often around 800x1000). Now, landscape images are clamped to 1500x1200, and portrait images are clamped to 1200x1500, so they both get the same overall size. This is important when viewing images on a monitor rotated to portrait.

The image resizing in post/show was tweaked to compensate. Previously it would only resize images if they were wider than the screen; now it resizes to fit the size of the window, since otherwise images were too tall for many monitors. This only happens if "Resize Images" is checked in your settings.