Successor to the Hubble Telescope Are there any plans for the 'Hubble2'? Maybe with an even bigger mirror capable of even finer resolution, to look even deeper into the origins of the universe?

If so, when can we expect to see it in action?
The James Webb Space Telescope (JWST) will be Hubble 2.0, and, my personal favorite, it could get a better look at planets in other solar-systems than we've ever had.   Scheduled for launch in 2018.  (Footnote, as Rob Jeffries points out, it's infra-red through long-wave visible light only).   Hence, no Blue/Indigo/Violet or Green, but some yellow.   So, it's not quite like Hubble, but it's still often called Hubble's replacement.

Chandra observes X-rays.

Spitzer observes infra-red.    They both followed Hubble, but they're not the same type of telescope.