  The IceCube experiment has recently released 3 years of data of the first
ever detected high-energy (>30 TeV) neutrinos, which are consistent with an
extraterrestrial origin. In this talk, we compute the compatibility of the
observed track-to-shower ratio with possible combinations of neutrino flavors
with relative proportion (alpha_e:alpha_mu:alpha_tau). Although this
observation is naively favored for the canonical (1:1:1) at Earth, once we
consider the IceCube expectations for the atmospheric muon and neutrino
backgrounds, this flavor combination presents some tension with data. We find
that, for an astrophysical neutrino E_nu^{-2} energy spectrum, (1:1:1) at Earth
is currently disfavored at 92% C.L. We discuss the trend of this result by
comparing the results with the 2-year and 3-year data. We obtain the best-fit
for (1:0:0) at Earth, which cannot be achieved from any flavor ratio at sources
with averaged oscillations during propagation. Although it is not statistically
significant at present, if confirmed, this result would suggest either a
misunderstanding of the expected background events, or a misidentification of
tracks as showers, or even more compellingly, some exotic physics which
deviates from the standard scenario.
