It may not seem like all that much changed after last night's Apple Store downtime, but the company actually made a number of design changes that, according to MacStories editor Federico Viticci, bring "a cleaner, more subdued style for graphical elements and larger image-centric spots for products and accessories."
Rolled out just in time to start selling the goods for Father's Day on June 16, the new design does away with the thin sidebars in favor of wider blocks that provide space for larger images of items on sale. Here's the old design: