According to NASA Headquarters in Washington, D.C.:
"NASA will host a media teleconference at 3:30 p.m. EDT on Wednesday, April 29 to discuss recent images returned from the New Horizons spacecraft as it nears its historic July 14 encounter with Pluto. Officials also will provide an update on the timeline and significance of images the mission team will receive in the coming weeks.

"Participants will be:

"--John Grunsfeld, associate administrator for the Science Mission Directorate, NASA Headquarters, Washington
--Alan Stern, New Horizons principal investigator, Southwest Research Institute, Boulder, Colorado
--Hal Weaver, New Horizons project scientist, Long Range Reconnaissance Imager telescopic camera instrument team, Johns Hopkins Applied Physics Laboratory in Laurel, Maryland"

Listen to the audio live stream right here:

Broadcast live streaming video on Ustream