I have SCCM 2012 SP1 R2, and the Dell Client Integration Pack 3.1.  When I try to import the WinPE 5 CAB from the SCCM console, it fails with "The selected driver pack is incompatible". 

Anyone else have this issue?  My understanding is that SCCM R2 supports Win 8.1, which is what Win PE5 is based on.

thanks in advance

Tony