Super Star Destroyer? If you're talking about the Executor-class, then you're off by many years. The Executor (also the first Super Star Destroyer) doesn't get built until shortly before the Battle of Yavin. The Victory-class (I and II) Star Destroyers (which is EU) were built during the Clone Wars. GL could use these EU ships as canon in Episode III. It would be very cool if GL used the Victory-class Star Destroyers. I heard somewhere (years ago) where he mentioned something about Star Destroyers being in (the end of) Episode III.
As for the TIE fighters, we might see the original TIE Fighter, but I very highly doubt we'll see the later TIE designs (being the TIE I/N, Interceptor, Bomber, Advanced X1, etc) in Episode III.
Yes, the TIE Interceptor was based on Darth Vader's TIE Advanced x1. The Empire found the TIE Advanced to be too expensive to mass produce. Some of the TIE Advanced designs were used build the TIE Interceptor (and TIE Avenger) shortly before the battle of Yavin. The TIE Interceptor wasn't mass produced until shortly before the battle of Endor, while the TIE Avenger (like the TIE Defender) never was mass produced. I'm hoping to at least see the original TIE Fighter (in Episode 3) which later became the TIE I/n (the standard TIE fighter we all know well).
As for the Super - class Star Destroyer, it's very possible that a protype (named the Super) was built before the Executor. Also GL may "run over" the EU history of the Executor. An EU author (I forget who) once wrote something funny about EU VS canon. "We were allowed the play in GL's driveway. However, if he decides to back his truck up . . . over what we built . . . we were warned beforehand."
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