re: Captain Marvel Trailer

quote:

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I see Cap’s shield, but what’s going on there?

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That's Norman Osborn, who after taking over SHIELD, acquired Tony Stark's armor and re-purposed it as the Iron Patriot. This comes near the end of Siege, the storyline where Osborn takes his Dark Avengers and attacks Asgard (it was floating above the American midwest after a series of events). Cap and others see Thor fighting the entire Dark Avengers, including Sentry, by himself. Cap rallies the real Avengers, and then more come in, it's hard to get into all the details.

I will say that those big events of the late 2000s were grand in scope.

The best ones to read, to get context in order:

Avengers Disassembled
Secret War (2004 - not to be confused with Secret Wars, the runs from the 80s)
House of M
Civil War
Planet Hulk (not a crossover, but ties in directly with...)
World War Hulk
Secret Invasion
Siege