I like the theory. Mainly because it makes sense. We know that full Uzumakis have bright red hair, have unique chakra which grants them unique abilities, and that they specialize in sealing, and by extension, summoning techniques. That being said, Tayuya meets all of those criteria. First, she has a unique genjutsu ability which rivals that of the toads' genjutsu. She also uses summoning to use special chakra-eating corpses, and finally, she has the right hair color. The hair especially is a rare trait, and since there are a lot of details early in the series that seem to foreshadow more recent events, I doubt it was a coincidence.
Furthermore, why would Kishi bring back the Sound ninja in Kabuto's fight against Itachi (and Sasuke)? They were beaten by a bunch of gennin in pretty much one-on-one fights. Kishi always says that he's known how the series is going to end. Perhaps the Sasuke Pursuit Arc was just a teaser for the War Arc and the end of the series.