The Proposed Final Draft for Servlet 3.0 is published.
There are quite a few  new feautures and enhancements.
To sum up in general;

• No more need to web.xml.Simply use annotations.  You just add @WebServlet  at the top of your Java class and that’s it!  For example:  @WebServlet(urlPatterns=“/foo”,  name=”MyServlet”, asyncSupported=true)

• Dynamic servlet registration. Programmatically configure and map servlets

• Configuration  frameworks by another xml ,web-fragment.xml, not touching web.xml.

• resources of web app like jsp’s and static pages are located in bundled jar files as well. They do not need to be in webb app’s root.

• Asynchronous servlet support

• Annotation-based security

• Cookie configuration by web.xml

Here is a very concise and informative presentation about servlet 3.0