http://pc.ign.com/articles/118/1182338p1.html
The relevant section:
3. The dragons are never-ending
Dragons are the big bosses of Skyrim and the battles with them appear to be suitably intense – at least if the climactic encounter in the game's E3 demo is anything to go by. You can use magic to summon electrical storms to combat them in the air, and when you inflict enough damage upon them they'll crash to the ground with all the heft of a mythical jumbo jet – carving out deep grooves in the earth and churning up dust and topsoil as their hulking bodies grind to a halt. Then once they're dead, you consume their souls and inherit their power. But the dragons will always come back.
"They're not limited, they're like any other creature in the game, they're not scripted – you can come across them as you play through the world but they don't go away," explains Lafferty. "It's not like you can defeat all of the dragons and they'll cease to exist – they'll always be there in the game. And they're also a central focus to the story – it's the first Elder Scrolls game with dragons - and you're dragon born, you can speak the language of the dragon. So it's just trying to figure out why the dragons are back, why they're special and how does that play out in the world?"
The relevant section:
3. The dragons are never-ending
Dragons are the big bosses of Skyrim and the battles with them appear to be suitably intense – at least if the climactic encounter in the game's E3 demo is anything to go by. You can use magic to summon electrical storms to combat them in the air, and when you inflict enough damage upon them they'll crash to the ground with all the heft of a mythical jumbo jet – carving out deep grooves in the earth and churning up dust and topsoil as their hulking bodies grind to a halt. Then once they're dead, you consume their souls and inherit their power. But the dragons will always come back.
"They're not limited, they're like any other creature in the game, they're not scripted – you can come across them as you play through the world but they don't go away," explains Lafferty. "It's not like you can defeat all of the dragons and they'll cease to exist – they'll always be there in the game. And they're also a central focus to the story – it's the first Elder Scrolls game with dragons - and you're dragon born, you can speak the language of the dragon. So it's just trying to figure out why the dragons are back, why they're special and how does that play out in the world?"
^^^^THIS... question answered. /thread.