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harkavyr:
That's just it, I think it could go either way. The fact it appears more than once, would seem to lead one to think it was intentional. Yet it's also one of those subtle things one might see hundreds of times and still miss, raising the possibility of it being an "injoke" or something.

Looking at it some more I think I would have to add modular wing tips and/or different models of Specter/Sylphid that feature different outboard wing types to the list. That's the next simplist explanation outside of AE I would think.

Jefffar:
Some how I knew you'd say it's an AE.

I don't think this is an instance of VG like on the Su-22, Mig-21 (IIRC the #), or previously mentioned. The edges appear to have different shapes depending on the shot. That would be inconsistant with VG (regardless of wingsweep angle, the moveable sections still retain the same shape). I had considered calling it VG, but went against it. That's why I went with calling it a more descriptive variable position wing.

I'd also considered the possibility they where canards, but wheren't properly placed to be called it so dropped it.

I think we are either dealing with different models of the fighter (I'm sure we could name quite a few real instances where this is true) or in the alternative the futuristic morphing wing shapes (change shape).

LEM:
You might be partially right about the F-16XL similarities, but the F-16XL didn't have the outboard section alter its shape like on the Specter/Sylphid.

As for why the 3 tails, they might be there:
-to isolate the morphing wing (if there) from the fixed wing, possibly even with it acting like S-Foil (X-Wing from Star Wars) if it was lost/damaged posibly indicating the technology was still new to limit is use
-maybe the end sections are modular and this was seen as the only way to make wing sections modular at the time
-perhaps to counter a known target with superior yaw or roll capacity (or the opposite to exploit a vulnerablity)
-Jeffar's it looks cool