I can imagine one of the Angels saying a witty remark. Let's not forget Kigai Yuuto. He has always been carefree.
And, yes, I have STRONG belief that this is the Dragon of Heaven. The difference being the two different futures the world will have.
If Dragons of Heaven win the battle of the apocalypse
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The world will suffer the constant showers of pollution and filth that mankind has created, and everything would die eventually.
If Dragons of Earth win the battle of the apocalypse
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The civilization will shatter, but the earth will finally enjoy a beautiful new era where living beings coexist on a great piece of everything that is good and green.
Now to come to think of it... I don't think I like the Dragons of Heaven, anymore.
But, hey, this is Tsubasa. I'm very doubtful as to this being the "ORIGINAL" X- world. Chances are, these people are probably not actually called Dragons of Heaven or even the Seven Seals. Most likely the case is that Sakura's feather traveled into this world and did something funny to it like it does to every other world.