WordPress.com has announced WordPress.com Enterprise a new service that brings the best of WordPress.com: all it’s paid upgrade services, including premium themes and Custom Design, and built-in WordPress.com VIP features such as 70+ vetted plugins which include integrations with top partners such as Flipboard, Chartbeat, and Facebook.
There is also a new Javascript customization service that allows you the flexibility to customize your site without needing to touch the underlying PHP code.
More information: http://vip.wordpress.com/2012/12/12/enterprise/