Interesting. Harry Knowles of AICN has been insisting for a couple years now that people at LucasFilm flat out told him there have been sequel trilogy plans for a while, but standard operation procedure was to deny publicly their existence until it was time to roll with them.
Dude, there were rumored plans for the final trilogy going back all the way to the birth
of Star Wars. Those of us old enough to remember that far back know this. The most prevelant rumor was that the core of the first big EU trilogy (the so-called "Thrawn Trilogy") lifted big-time from the story ideas for 7-9.