  Several attempts have been made in the past to assess the expected number of
exoplanetary transits that the Gaia space mission will detect. In this Letter
we use the updated design of Gaia and its expected performance, and apply
recent empirical statistical procedures to provide a new assessment. Depending
on the extent of the follow-up effort that will be devoted, we expect Gaia to
detect a few hundreds to a few thousands transiting exoplanets.
