OK, we have had cloaking of objects using these matematerials. Now along comes an experimental demonstration of not spatial cloaking, but temporal cloaking!
Abstract: Recent research has uncovered a remarkable ability to manipulate and
control electromagnetic fields to produce effects such as perfect
imaging and spatial cloaking. To achieve spatial cloaking, the index of
refraction is manipulated to flow light from a probe around an object in
such a way that a ‘hole’ in space is created, and the object remains
hidden. Alternatively, it may be desirable to cloak the occurrence of an
event over a finite time period, and the idea of temporal cloaking has
been proposed in which the dispersion of the material is manipulated in
time, producing a ‘time hole’ in the probe beam to hide the occurrence
of the event from the observer. This approach is based on accelerating
the front part of a probe light beam and slowing down its rear part to
create a well controlled temporal gap—inside which an event occurs—such
that the probe beam is not modified in any way by the event. The probe
beam is then restored to its original form by the reverse manipulation
of the dispersion. Here we present an experimental demonstration of
temporal cloaking in an optical fibre-based system by applying concepts
from the space–time duality between diffraction and dispersive
broadening. We characterize the performance of our temporal cloak by
detecting the spectral modification of a probe beam due to an optical
interaction and show that the amplitude of the event (at the picosecond
timescale) is reduced by more than an order of magnitude when the cloak
is turned on. These results are a significant step towards the
development of full spatio-temporal cloaking.
There is also a News and Views article on this work in the same issue of Nature.
I'm still reading this, but thought those who have access to Nature might want to looking into it. Fascinating work!
 M. Fridman et al., Nature v.481, p.62 (2012).