One of the major differences is that WinZip will now offer a Standard and a Professional version. The standard version is free and will contain most of the features we're used to, while the paid professional version will include additional functionality.
The new version has a new interface which mimics Windows XP's Windows Explorer and should zip archives faster than its predecessors. The new Explorer-style interface will use a three-structured view of the folders in your zip file. This view will appear on the left but can also be switched of according to your preference. The new interface also enables you to display only the files and subfolders in the currently displayed folder and enables you to easily create and delete folders in your zip file. Dragging files to folders and subfolders will also be plain simple.
WinZip 10.0 now includes support for PPMd and bzip2 compression within the Zip file format which, according to WinZip, may greatly improve compression. Another convenient feature is Zip to CD. This will enable you to burn zip files directly to a CD. Larger Zip files will automatically span multiple CDs, if necessary.
One of the main additional features to the Professional version appears to be WinZip Job Wizard, which allows users to schedule archive instructions. WinZip says you can use WinZip jobs for periodic reporting, off-site storage, daily data backups, and anything else that you do repetitively. Even uploading Zip files automatically won't be a problem.