re: Another MER news briefing tomorrow, Tuesday, June 15.
I don't know if this is coincidence, or evidence of it being a significant news conference after all but...
nasawatch.com posted, dated June 11
" Editor's note: Word from NASA sources has it that Sean O'Keefe is enroute to California to do a Gravity Probe-B review at Stanford University. He will then travel to Pasadena for a Mars Exploration Rover update at NASA JPL. O'Keefe's travelling companion on this trip is Sen. Ted Stevens (R-AK), Chairman of the Senate Appropriations Committee."