The Energon Pub

• Scenes appearing in the Japanese trailer for the movie show a much larger Decepticon armada than is seen in the final take, footage of Mirage and Bluestreak, and Skywarp being shot down in an approach to Autobot City.

I read this at TFwiki and thought maybe it was a reference to the promotional trailer; which does feature unique footage like Snarl & the Dinobots listening to Kup's story in robot mode. But I guess that's not it since I can spot neither Mirage or Bluestreak..?

It might be in the extras of the 20th anniversary DVD release. Not sure.

This?

Hm, that's the same as the one I linked to in my post.

It's either on the UK Reconstructed DVD release, or on one or both of the 20th anniversary releases.