It says on the Skynews website that the launch window is only until the end of July due to the orbit of the space station. However, when it is re-scheduled, it will be a daylight flight as Nasa wish to photograph the ascent.
I notice from the Nasa website also that Atlantis has a launch window of Sept 9th to 24th for its next mission. I arrive in Orlando on 18th Sept so lets hope I catch it.
On our first visit in 1999, we saw the launch of the shuttle during May from our villa backlot at 6am. Desipte being 40ish miles away it was a stunning sight and via my Camcorder zoom, was able to pick out the craft ascending very nicely.
This year though, If I've got the chance I will be driving a little nearer to view the event.