Iver,
7x will be crewed by senior Line training Captains first, so they can teach eachother and then later teach the 7X Line captains. When there are enough line captains then the FO´s come into the picture.
I think it will take at least until middle to late 2009 that the first FO´s will arrive on line.
Its just an estimate ofcourse, dont kill me if I´m wrong.
N.