The WIC package installer is now available on MSDN:

x86: http://www.microsoft.com/downloads/details.aspx?FamilyId=8E011506-6307-445B-B950-215DEF45DDD8&displaylang=en

x64: http://www.microsoft.com/downloads/details.aspx?FamilyId=F64654AC-6E26-41D9-A90A-0E7783B864EE&displaylang=en