There will not be a MEDC conference next spring (2008), instead the MEDC conference will be integrated into the new Tech Ed Developers conference.
What is TechEd?
TechEd is Microsoft’s premier global conference designed to provide Developers and IT Professionals with the technical education, product evaluation and community resources for architecting, developing, managing, securing, and mobilizing state-of-the-art software solutions for a connected enterprise.
TechEd U.S. 2008 Expands!
To better serve the distinct needs of the developer and IT professional communities in the United States, Tech·Ed U.S. is evolving from a one week conference to two separate back-to-back conferences: Tech·Ed U.S. 2008 Developers, June 3-6, and Tech·Ed U.S. 2008 IT Professionals, June 10-13, in Orlando, FL.
The two week format is designed to provide the same Tech·Ed experience, but with expanded learning opportunities for attendees, which means more sessions and the need for more speakers.
For more information, see here: http://www.microsoft.com/events/teched2007/default.mspx