Puddles said:
Tyrion isn't a fucking Targaryen. If he is, that would be a pretty horrible decision, on the same level as a lame comic-retcon. If that happened, I'd expect the next revelation to be that the Sandor Clegane who died was actually a Skrull.
Sandor Clegane
is alive, though. He's the big gravedigger on the Quiet Isle. The Elder Brother specifically says that "The Hound" is dead, and tells a story about he essentially died and was reborn after the Battle on the Trident when he washed up there. When asked further if Sandor is dead, he says that he is "at peace".
For what it's worth, I think there's a greater chance of Jaime and Cersei being the ones sired by Aerys (if indeed any of the kids were). It would add more to whole bit with Tywin being upset when Genna said Tyrion was his true son (because it would be reminding him of that fact), and it would also result in Jaime and Tyrion having both killed their father. The only real hint is Cersei watching the flames when she burned the Tower, but it's something.
Personally, I think Martin is just messing around with folks, though.