I think the obvious part of that story is the question mark in the title.... he's not publically signed for SEAT next year, equally - they've not confirmed their plans for 2008 either (though it's not rocket science)
the fact that they tested the 4 top drivers in the Cupra's is part of the prize package for 2007, they were always going to do that.
Darren was there early on to shake down both cars, JP was there all day.
I expect DT to run in 2008
I hope that either he grows some racing balls, or they get someone with ready grown.
To suceed in anything in 2008, SEAT must have a) new cars b) two top drivers c) the best team (again) - not a repeat of 2005 where they were spread too thin.
Consistancy for drivers is key, so no split drives. no pay drives (as this opens you up to sucky drivers)
This is all my opinion clearly, based on guestimates