Evernote's blog post on the update goes into more detail:
Today, Evernote for Windows Phone gets a great update that includes a bunch of powerful new features. We’ve added support for Evernote Business, improved creation and editing of styled text, added PIN Lock for Premium users, and more.
- Evernote Business support
- PIN lock
- Joined Notebooks
- Styled text support
Evernote continues to offer a free service with some usage limits, alongside a premium subscription for £4/$5 per month, or an annual fee of £35/$45. Clients are also available for iOS, Android, Blackberry, and a number of other mobile platforms, as well as the web based versions and desktop clients. It's a genuine cross platform suite for saving and sharing information on a personal and professional level.
You can find the Evernote client in the Windows Store.