  In this talk I review a series of recent conceptual developments at the
interface of the quantum and gravitational realms. Wherever possible, I comment
on the possibility to probe the interface experimentally. It is concluded that
the underlying spacetime for a quantum theory of gravity must be
non-commutative, that wave-particle duality suffers significant modification at
the Planck scale, and that the latter forbids probing spacetime below Planck
length. Furthermore, study of quantum test particles in classical and quantum
sources of gravity puts forward theoretical challenges and new experimental
possibilities. It is suggested that existing technology may allow to probe
gravitationally-modified wave particle duality in the laboratory.
