  It has been believed for a long time that the tensionless limit of
superstring theory can be described by a higher spin gauge theory. Recently, a
concrete realization of this idea was proposed via 3d Aharony-Bergman-Jafferis
(ABJ) theory with the help of holographic duality. In this note we review our
work on finding a similar relation involving 2d coset type models. We start by
proposing and examining holographic dualities between 3d higher spin gauge
theories with matrix valued fields and the large N limit of 2d coset type
models. After that we discuss possible relations to superstring theory with
emphasis on the role of the matrix form of the higher spin fields and the
extended supersymmetry.
