http://www.jwst.nasa.gov/ lists the launch date as 2013. Yikes! Even still, with the cost overruns that will almost for sure happen you would think saving money now may be in everybody's best interest. Perhaps Hubble has outlived its usefulness. We can get by with our ground based observatories until then, finetune our cosmological understanding between now and then with CERN et. al, and in 7 years have that bad boy up in space with its 6.5m mirror and put Hubble to shame.