Ehhh, tough to say...they might drop a little bit, but probably not "much" (which is all relative, of course).
If you're hoping for that model year to lose, say, $7K in value by then, don't count on it. Could similar cars lose $1K, $2K, or $3K in "value" by 2010? Maybe. It all depends.
Remember, the biggest depreciation "hit" always occurs the moment you purchase a new car and drive it off the lot. The first two or three years after that the car will take pretty significant depreciation hits as well but after that it begins to level out.