Yes the exams required to gain MCITP: Enterprise Administrator retire in July 2013
Yes you can switch to the 2012 track without finishing the 2008 track however your existing certifications (70-680 and 70-642) cannot be used to gain 2012 certifications i.e. you will need to start from scratch with the new 2012 certifications.
Given that you've already got 70-642 and you're currently studying 70-640, your best option may be to do the 70-640 and 70-646 exams to get your
MCSA: Windows Server 2008 certification and then upgrade this to MCSA: Windows Server 2012 by doing exam
70-417.
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Jeff Wharton
MSysDev (C.Sturt), MDbDsgnMgt (C.Sturt), MCT, MCPD, MCSD, MCITP, MCDBA
Blog: Mr. Wharty's Ramblings
Twitter: @Mr_Wharty
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