ESA has issued a 'Call for Declarations of Interest in Science Instrumentation' for the M-class Cosmic Vision mission studies Plato, Cross Scale and Marco Polo. A similar call for the M-class mission study Euclid will follow on 15 May.
Prospective Principal Investigators are invited to submit proposals outlining the composition of nationally funded consortia to carry out assessment level studies. Responses are due by 16:00 CET on 30 June 2008.
Full details at http://sci.esa.int/cvpl_call