  The current status of the lattice-QCD calculations of the form factors of the
$B\to D^\ast\ell\nu$ semileptonic decay is reviewed. Particular emphasis is
given to the most mature calculation at non-zero recoil coming from the
Fermilab Lattice and MILC collaborations. Blinded, preliminary results for the
form factors are shown, including a preliminary, but detailed error budget. The
lattice results seem to favor a large slope at small recoil, in contrast to the
latest untagged results coming from the Belle collaboration. A comprehensive
comparison between the latest BGL $z$ expansions of Belle, Babar, the lattice
and a joint BGL fit including lattice and Belle data is presented, and a
roadmap to improve the current calculation is discussed. The current
implications for $V_{cb}$ and $R(D^\ast)$ are discussed.
