They have a new TV trailer up. I'm not sure why they did it this way because the trailer seems to be a pretty big spoiler and you'll probably see it on TV. Not so much in terms of story but in terms of presentation. I can't really explain with out spoiling it so here is the trailer and my explination as another spoiler. It's CGI and not ingame footage:
I know we all knew that this was what happened at the halfway point in the story (Lionhead constantly told us.) but I don't think they should have shown us this. It would be a whole lot more "epic" if we thought we'd be attacking the castle with a handful of NPCs but this shows it will actually be a full blown army.
It's CGI and not ingame footage but it still seems to be showing what'll happen plus this basic scenario was supposed to be the ending to Fable II with Lucians Spire Army battling with an army of Heroes but that didn't fit so they seem to have moved it to Fable III and changed some details.
We are getting into seriously spoiler heavy territory now. I've seen screenshots giving away all sorts of things so I'm avoiding news as much as I can while still trying to keep up to date on non-spoilers.