Actually, I would much rather see a Twilight Princess prequel. The plot, as was mentioned previously, was pretty much wrapped up at the end, so a sequel does not sound rational.
A prequel, however, is quite the opposite. There were a lot of things in Twilight Princess that had very little if any backstory, and a prequel could easily tie up those loose ends. For example, we could get a game revolving around the Dark Interlopers, and showing just how they evolved into the Twili race that we saw in the game. I would be very interested to see just how exactly that mysterious race came to be, and a game preceding the events of Twilight Princess could easily tell that story. A game like that could also explain the origin of the Light Spirits. Were they created in order to protect the light world from the newly evolved Twili race? This could all be explained in one game. A sequel to Twilight Princess would have nothing to go on in terms of plot, whereas a prequel would.