WordPress recently announced its movement towards CMS improvements instead of its longstanding dedication to blogs. –Not in the slides, brought to you by Sethmatics in lieu of Matt Mullenweg (founder of WordPress)
Customize Data layout, multi-author and roles and permissions, multisite to run X websites on single codebase.
Integration: API with XML-RPC and REST / builtin ajax classes
Plugins for Active Directory/LDAP, Salesforce, Adobe SiteCatalyst, Brightcove (video) and thousands more.
Social with Twitter, Facebook, Tumblr, LinkedIn, and the like
Scalability allows high traffic and volume, built in caching, developer tools, and WordPress.com proves you can host 4,000,000,000 page views per month, 500,000 blog posts per day, 400,000 comments every day and all from a single install of WordPress.
Security: major groups have vested interest in WordPress, more secure every release with testing and code review by the core team, US Government, financial intuitions and other groups.