NASA Selects Small Explorer Investigations for Concept Studies
"Following detailed mission concept studies, NASA intends to select two of the mission proposals in the spring of 2009 for full development as SMEX missions. The first mission could launch by 2012. Both will launch by 2015. Mission costs will be capped at $105 million each, excluding the launch vehicle."
Editor's update: Originally there were going to be three selections made. Now only two are being selected. One more mission sacrificed ($105 million saved) to feed MSL overruns, it would seem.