  A new estimate is presented of the dileptonic $B$ decays
$B\to\pi\ell^+\ell^-(\ell=e,\mu,\tau)$ in naive factorization within the
standard-model (SM) framework. Using a combination of several approaches, we
investigate the behavior of the $B\to \pi$ form factors in the entire region of
the momentum transfer squared $q^2$. For the vector and scalar form factors, we
employ the light cone sum rule (LCSR) with a chiral current correlator to
estimate, at twist-2 next-to-leading order (NLO) accuracy, their shapes in
small and intermediate kinematical region. Then a simultaneous fit to a
Bourrely-Caprini-Lellouch (BCL) parametrization is performed of the sum rule
predictions and the corresponding lattice QCD (LQCD) results available at some
high $q^2$'s. The same approach is applied for the tensor form factor, except
that at large $q^2$ we use as input the LQCD data on the corresponding $B\to K$
form factor in combination with a $SU_F(3)$ symmetry breaking ansatz. Employing
the fitted BCL parameterizations, we evaluate, as an illustrative example,
several of the observables of the charged decay modes
$B^-\to\pi^-\ell^+\ell^-$, including the dilepton invariant mass distribution
and branching ratio. For the dielectron and dimuon modes, the branching ratios
are estimated at
$\mathcal{B}(B^-\to\pi^-e^+e^-)=(2.263^{+0.227}_{-0.192})\times10^{-8}$ and
$\mathcal{B}(B^-\to\pi^-\mu^+\mu^-)=(2.259^{+0.226}_{-0.191}) \times10^{-8}$.
The latter shows an excellent agreement with the recent experimental
measurement at LHCb and hence puts a stringent constraint on the contribution
from possible new physics. We arrive at, for the ditau mode,
$\mathcal{B}(B^-\to\pi^-\tau^+\tau^-)=(1.017^{+0.118}_{-0.139})\times10^{-8}$,
which is one order of magnitude larger than the existing theoretical
predictions.
