Apple stated the following in the press release:
"The five-day event, scheduled to run from June 11 to June 15, will deliver more than 150 sessions and labs aimed at getting the most out of Leopard. The conference will also include new content to serve a wide range of developers, including Mac OS X Immersion Monday, designed to quickly get developers who are new to the Mac® up to speed; a content and media track that shows developers the best ways to integrate animation, motion graphics, video, rich-media and web-based content into their applications; and dozens of hands-on labs that offer a unique opportunity to work directly with Apple engineers."

Other Activities at WWDC 2007
Apple outlined additional activities for the event which include the following:

1. Presentations from Apple engineers
   Apple engineers will provide in-depth demonstrations of Leopard's open source foundation,  new technologies, and innovations such as Xcode® 3.0, Dashcode, Core Animation, Time Machine, iChat Theater and more
   
   
2. Practical hands-on sessions
   The sessions will provide conference attendees with an ideal way to learn how Apple uses coding strategies and techniques to create Cocoa bindings, build Automator actions as well as ways to integrate iCal events into an application
   
   
3. Technology labs
   The labs will allow attendees a way to work one-on-one with Apple engineers on various areas such as Cocoa, Open GL and AJAX
   
   
4. Special Events
   Apple Design Awards and Stump the Experts

WWDC 2007 Cost and Registration
The five-day WWDC event will costs $1,595 (US) per attendee.  Those who sign up by May 11 can shed $300 (US) off the cost thanks to the Early Registration Discount.

You can visit Apple's WWDC website for registration and complete session details.  You can view the full press release here.