Notes from the February, 2014 meeting:

CWG felt that the best approach would be, when comparing P and A, if A is a pack and P is not, A should be repeated for each remaining instance of P and then use the variadic/nonvariadic criterion as a late tiebreaker if the result is still ambiguous. This would apply in the general case (including 13.10.3.5 [temp.deduct.partial]), not just in function calls.