I just figured out who that dragon is... it is NOT Alduin. I thought it was originally, but that didn't seem to make much sense.

The real question is why did the dragon stop the execution and save you? Especially if it was Alduin your arch nemisis... it would make way more sense if the dragon killed you in the attack being dovahkiin and all.

Also, the dragon looked similar to Alduin, but there were some slight differences (he is also very small for a "world eater")

So while I was wondering this I remembered there is a dragon later in the game that teams-up with you so I went back and watched the GT.TV footage to compare them and it's the SAME dragon!! The dragon that saves you from your execution is the one you can call later in the game to aid you in battle. If you think about it, this makes a lot of sense, there probably aren't very many good dragons out there that would save dovahkiin and later help him kill other dragons. Don't know his name yet, I'll try to look for it, but yeah, go watch the GT.TV footage for yourself and you'll see dragon you call and the one in the leaked tutorial are one in the same.

I was thinking that myself we will see lol

http://www.gamesas.com/index.php?/topic/1248291-spoiler-speculation/

They don't look anything alike. The one that we apparently summon appears to be a faded red color, the one in the video was black.

I thought the same thing, the tail of both the dragon in the execution and the dragon that you ally with is different.

this.

also from the previous 50 forum posts about this we concluded that the dragon is the same as the CE statue and one of the following is wrong:

1) Todd confirmed that the CE statue is Alduin

2) The dragon is a jill

there is already a thread for this and we have been discussing it there