  What is the origin of the numerous population of diffuse elliptical galaxies
(dE) in clusters? These galaxies formed their stars several billion years ago
and lost their gas. Though the stellar winds resulting from star formation and
the interactions with the environment undoubedtly play a role, their respective
role and details of the mechanism of this evolution is still debated.
  In this presentation we will review the first 3D spectroscopic observations
of a handful of dE galaxies. These data reveal complex kinematical structures,
with embedded discs and counter rotating cores, and they open extremely
promising perspectives for studying the history of the stellar population
throughout these various features.
  The presence of disks, which was already known from detailed image analysis,
and of complex kinematics and the new constraints on the stellar population
enforce the hypothesis of the evolutionary connection between dEs and disk
galaxies.
