The MCSE: Desktop Infrastructure requires passing exams for the MCSA: Windows Server 2012 track at the Associate level, then passage of these two exams:
70-415: Implementing a Desktop Infrastructure
70-416: Implementing Desktop Application Environments
Information on these exams has yet to be posted on the Microsoft Learning site.
The MCSE: Server Infrastructure is farther along in development, with exams available in beta testing format at TechEd. This track requires passing three exams:
70-410: Installing, Configuring Windows Server 2012
70-411: Administering Windows Server 2012
70-412: Configuring Advanced Windows Server 2012 Services
More information on the new Windows 2012 tracks can be found on Field's blog post here. To read our earlier news about the revamped certifications, go here.