ipsender writes with a NASA announcement:
"NASA will host a news briefing on Thursday, Aug. 4, at 11 a.m. PDT (2 p.m. EDT) about a significant new Mars science finding. The briefing will be held at NASA Headquarters in Washington. The new finding is based on observations from NASA's Mars Reconnaissance Orbiter, which has been orbiting the Red Planet since 2006."
You can catch the briefing online at the NASA TV