This isn't the first time, nor will it be the last when Lego reveals important plot details for upcoming movies. And this time it is again the sets for Avengers: Age of Ultron which give away some plot details for the film.
Of course, the toys and their descriptions aren't always accurate. However, you should read with caution what is written bellow, since what is said may turn up to be true.
The Lego sets
There are five Lego sets and each of them describes a particular scene from Avengers: Age of Ultron. The scenes are as it follows: 1. Attack on the Avengers Tower, 2. The Avengers Quinjet City Chase, 3. Hulkbuster Rescue Mission/The Hulkbuster Smash, 4. Duel with HYDRA/HYDRA Showdown and 5. Iron Man vs. Ultron.
We have covered the Hulkbuster Rescue Mission in here, so moving on to the others.
What is further revealed?
The first Lego set reveals that indeed Ultron is an AI that manages to assemble itself, most likely by using some of Tony Stark's spare parts from the suits. What is further revealed is that HYDRA is also involved in some way, since Ultron is from this first attack in the possession of Loki's mind controlling scepter. Also, one of the heroes is injured during this initial fight (most likely James Rhodes, as he is seen in the background during the second trailer holding his arm as if wounded).
The second Lego set reveals that the Quinjet is transporting a precious cargo - by all means, as seen in the trailer, this precious cargo is in fact the people the Avengers saved. But then again there could also be some other goods in there, since Vision is also mentioned on the Lego set description.
Hawkeye takes the lead
Kevin Feige and Joss Whedon said that Hawkeye will be put in a better light in Avengers: Age of Ultron. The 4th Lego set reveals that he is the one to actually take down the HYDRA rogues, with Thor lending a hand (or hammer) when the villains try to escape.
Finally, the last Lego set includes a fight between Iron Man and some Ultron henchmen (most likely, these are members of the Iron Legion). It is a fight in which Iron Man will make the most of his new suit, a different one than previously revealed (the Mark XLIII, which can be found in here) - his Mark MK45.
