The European Space Agency (ESA) plans to launch the Gaia spacecraft in spring of 2013. The spacecraft will contain a billion pixel camera.
From the Gaia wiki entry:
Gaia will create an extremely precise three-dimensional map of stars throughout our Milky Way
galaxy and beyond, and map their motions which encode the origin and
subsequent evolution of the Milky Way. The spectrophotometric
measurements will provide the detailed physical properties of each star
observed, characterising their luminosity, effective temperature, gravity and elemental
composition. This massive stellar census will provide the basic
observational data to tackle a wide range of important problems related
to the origin, structure, and evolutionary history of our Galaxy. Large
numbers of quasars, galaxies, extrasolar planets and solar system bodies will be measured at the same time.
Really cool stuff.