Good trailer, I really look forward to this film. Still, I am little bit worried about the amount of characters they will have to juggle around with and the fact that it will be a standalone film. The scope is huge. The Russo's did a very impressive job with Civil War, which managed to juggle many different types of characters (personality wise but also power wise) and give them all a clear arc and character motivation and make them work together on a screen. But this film will have all those characters and much more. From what I gather, I think we will see three main crews for most of the film, Cap/BP/Hulk & co, Stark/Spidey/Strange, and Thor/Guardians. Probably with Cap, Stark, and Thor as the "lead" heroes, just like Cap and Stark were in Civil War for their respective teams. And I assume that Thanos will get a decent amount of screen time, they really can't waste him like Ultron or many other MCU villains.
I hope for this milestone in cinema (yes, I think it absolutely is in terms of scope), they go full on Lord of the Rings and make it a long ass film with potentially an extended edition. I don't think Disney/Marvel will, but I feel like this film could easily warrant a long running time and accompanied costs.
What is this, a MCU trailer with no jokes??? DEAL BREAKER
I know you joke, but the first third or so of Civil War was pretty serious. I expect that when Thanos is going to wreck shit in an early act, the film will be dead serious for a while. And looking at the job these directors did with the Winter Soldier and Civil War, probably the most serious MCU flicks, I think it will work.