- the Nobel committee announced that its physics award goes to Saul Perlmutter and Adam Riess of the US and Brian Schmidt from Australia for the research that identified the "accelerating expansion of the Universe", see http://www.bbc.co.uk/news/science-environment-15165371
- ESA Cosmic Vision panel approved two middle size missions as a part of its Cosmic Vision 2015-2025 plan. These are Euclid and Solar Orbiter.
For more information, refer to http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=42267
In terms of instruments WL requires extremely high image quality and BAO requires fine spectroscopy. Both techniques employ fine infrared detectors which ESA currently buys from US.
The mission that has the concept of using Type Ia supernovae to probe dark energy is the future NASAs Wide-Field Infrared Survey Telescope or WFIRST.
The Astro2010 Decadal panel identified WFIRST (http://wfirst.gsfc.nasa.gov/) as the top priority mission for the upcoming decade. However, NASA's James Webb Space Telescope is scheduled to launch in 2018 and this large mission is keeping WFIRST from being implemented until perhaps the 2020s.
As proposed, WFIRST will measure the properties of more than a thousand supernovae which can be used to directly calculate the luminosity distance (DL). On the other hand, certain spectral features in the supernova light can be used to identify z (redshift) and provide the distance-redshift relation D(z), which is a primary observable of the effect of dark energy. For more information, see http://wfirst.gsfc.nasa.gov/science/de/.
But WFIRST is delayed to 2020s the soonest.
I wonder if S. Perlmutter's and colleagues' Nobel price can help NASA find the money to build WFIRST sooner?
As alternative, NASA can ask about participation in Euclid. I know that in the past ESA offered NASA a 20% partnership in the mission. NASA, for example, could provide the infrared detectors which are not available in Europe (yet). I don’t think NASA can get more participation, especially after issues with IXO (http://sci.esa.int/science-e/www/area/index.cfm?fareaid=103). But it would be great to have at least 20%, although I wonder if it would be possible.