I wonder if the defection of that Mig 21 earlier this week was significant in this shootdown? Perhaps the Syrians mistakenly thought another of their fighters was making a bolt for it.
I doubt much will come of this, after all both of the F4 crew reportedly survived. There's been several border skirmishes over the past few months - despite their bluster the Turks don't really have the stomach to square up to Syria. Its not their fight.