Yesterday's prelaunch press conference is archived on the invaluable
SPACE MULTIMEDIA site, which has emerged as a crucial resource for devotees of nasa press briefings, even though its main focus seems to be shuttle and ISS operations.
For me there were two highlights: (i) meeting Chuck Dovale, who I gather
alternates as launch director with Omar Baez, who led the New Horizons launch, and (ii) learning a little about the way the launch "instant" times can be manipulated (in this case, scheduling the launch for the morning, when the weather's better) by varying the coast time between the second stage firings.
TTT
EDIT: Baez also figures in one of the many insightful vignettes which make Roving Mars such an instructive as well as entertaining book. pp. 210-211.