But why should we care about Spidey unmasking? Or more to the point; why should anyone in the MCU care? We haven't heard a thing about Spider-Man in the MCU, so him unmasking would have no impact, nor any substance. A vigilante nobody's heard of unmasking shouldn't be the cause of any conflict in the movie. There really isn't a logical place for Spidey in the movie beyond a brief introduction, or montage of heroes in some sort of scene establishing resgistration.
Unless they change Spider-man's story a little and his unmasking leads to the death of someone close to him within the movie like Gwen Stacey. Also, I don't know if this is even possible, but if they are able to cast Peter Parker / Spider-man soon I wouldn't mind if it was able to go down like this.
End Credits: Age of Ultron..... Peter Parker is on a field trip and gets bit by a radio active spider.
Opening credits Civil War...... A quick run down of Spider-man's origin with Uncle Ben being killed and showing some clips of him being a student, Flash Thompson being a bully & Gwen Stacey being in a relationship with him, stuff like that. It could be done in a similar fashion to how the Incredible Hulk Opening Credits Intro was put together.
Movie intro of Civil War...... is something like the intro to Winter Soldier, where there is a intro villian battled for the first few minutes of the movie, except instead of it being Captain America fighting Batroc, in Civil War it is Spider-man battling Green Goblin. Green Goblin is being bested and escapes.
Then it starts up with S.H.I.E.L.D. tasking Maria Hill with having all Super Hero's register with the government as well as their true identities. It is being marketed as it is a public safety concern and therefore it is the governments responsibility.
Then the movie shifts to Captain America and Iron Man having disagreements about registration and how much power should the government really have. This leads to a divide between the 2 and alliances within the Avengers start forming for both sides.
Eventually Spider-man comes into the mix and he is convinced by Iron Man that releasing his identity to the public will help defuse this feud that is brewing with the heroes. So, Spider-man unmasks himself as Peter Parker, and Norman Osborn takes advantage of this information and seeks out Gwen Stacey and kills her along with a bunch of other kids from Peter's school (This event can somewhat mirror the events of the New Warriors and Nitro killing the School Childeren). This leads to Captain America and Iron Man's feud reaching a boiling point and it breaks out into a full out war of the heroes.
Some really spectacular Hero Battles take place, but while the heroes are preoccupied with each other it allows the villains to do what they want, and it eventually even leads to Crossbones killing Cap.
Then we have Spider-man going into a Solo movie in 2017, with a Green Goblin on the loose responsible for killing Gwen Stacey. He can remain a villain in the background that Spider-man plans to hunt down and bring to justice, at this point he still does not know it is Norman Osborn. This allows for the main villain to be either Kraven the Hunter or perhaps Mysterio, and a Green Goblin to be a returning menace in like Spider-man 4 or 5.
Then have Captain America return during Infinity Wars Part 2 as part of the results of Thanos either playing with the Time or Reality gems.
Well just some thoughts.
Surfer