  We present a progress report on new calculations of B and B_s meson decay
constants employing NRQCD heavy and HISQ light valence quarks and using MILC
N_f = 2+1 AsqTad lattices. Bare quark masses have been retuned in accord with
HPQCD's new r_1 scale. We find significant reductions in discretization effects
compared to previous calculations with AsqTad light valence quarks. Matching of
the NRQCD/HISQ heavy-light axial vector current is carried out at one-loop
order including all relevant dimension 4 current corrections.
