On the user interface side, Safari now features a new homepage with access to your bookmarks, but most importantly, it will feature a new sidebar. This sidebar now gives you access to your bookmarks, but also your reading list. One new feature for the reading list is the addition of shared lists.
Apple is also adding iCloud Keychain to Safari. This is essentially a cloud-connected password manager for Safari that seems to work a bit like Lastpass. It’ll support passwords, but also save credit cards and other information.
Other new features include one-click bookmarking and a new look for Reader.