Dreamweaver is a part of the Adobe Creative Cloud offering. You can download Dreamweaver from http://creative.adobe.com, and receive updates as and when they are available, through Adobe Application Manager (installed along with Dreamweaver).
For more information on subscriptions to Creative Cloud, read Adobe Creative Cloud FAQ.
What's New in Dreamweaver CC (13.0)
New features overview
Paul Trani, Senior Product Evangelist, Creative Cloud, provides an overview of the new features in Adobe Dreamweaver CC.
Highly intuitive visual editing tool that helps you generate clean web-standard code. Using this tool, you can quickly view and edit styles that are relevant to a particular context (or page element). Apply properties such as gradients and box-shadows with just a couple of clicks.
Synchronizing Dreamweaver settings with Creative Cloud
Store your files, application settings, and site definitions on Creative Cloud. Log on to Creative Cloud and access these files and settings from any machine whenever you need them.
You can set up Dreamweaver to automatically synchronize the settings with the cloud. Or, you can do an on-demand synchronization whenever required using the toast notification (click in the Document toolbar) or the Preferences > Sync Settings dialog box.
From an expert:
Cloud Sync: Log in to Creative Cloud from any computer and access your files, settings, and site definitions.
Modern platform support
Author projects using HTML5/CSS3, jQuery, and jQuery mobile frameworks. Develop dynamic pages in PHP.
Drag-and-drop accordions, buttons, tabs, and many other jQuery widgets in your documents. Make your websites more interesting and engaging with jQuery effects (Windows > Behaviors > Effects).
Simplified user interface
The Dreamweaver CC user interface is modernized with fewer dialog boxes. The improved interface helps you develop websites more efficiently with intuitive context menus.
For more information on what has changed in the user interface, see this article.