According to their press release, the participants of the conference will be:

Michael Meyer, lead scientist for the Mars Exploration Program at NASA HeadquartersBruce Jakosky, Mars Atmosphere and Volatile Evolution (MAVEN) principal investigator at the Laboratory for Atmospheric and Space Physics (LASP) at the University of Colorado, BoulderJasper Halekas, MAVEN Solar Wind Ion Analyzer instrument lead at the University of Iowa, Iowa CityYaxue Dong, MAVEN science team member at LASPDave Brain, MAVEN co-investigator at LASP

After the conference, there will be a Q&A session with the media, as well as a social media component by tagging questions with #AskNASA.