We are all excited to see Spider Man for the first time in the Marvel Cinematic Universe. What is bothering us right know is when will he show up for the first time. When Marvel announced their deal with Sony, they mentioned that Spider Man will not have only his own movie, but that he will appear in a MCU movie prior to his solo picture. At that time, there were 5 possibilities: Avengers: Age of Ultron, Ant Man, Captain America: Civil War, Doctor Strange and Guardians of the Galaxy 2. When we desperately saw the fake end credits scene of Avengers: Age of Ultron and the real one, we know now that Avengers: Age of Ultron is out of that list. As of now, the most plausible movie that Spider Man can appear is Captain America: Civil War, but do not think that Spider Man can not appear in the other movies because he has a big role in the Civil War storyline from the comics.
Now, according to Latino-Review, there are rumours that some Spider Man references will be in Ant Man. It did not mention that Spider Man will be in Ant Man: the chances of Spider Man appearing in one of the 4 movies have not change following this rumor.
Also, we do not know officially who is going to play Spidey: 6 actors have the chance to become this superhero: Tom Holland, Asa Butterfield, Judah Lewis, Matthew Lintz, Charlie Plummer and Charlie Rowe. According to the Hollywood Reporter, these actors screen-tested for the role of Spider Man in Atlanta. Like a coincidence, Captain America: Civil War is shooting in Atlanta at the same time. Now, the hopes are higher that Spider Man will appear in the Captain America threequel.
For the casting, there were rumors that these 6 actors were cut to 2 actors to play the newcomer in the MCU: Tom Holland and Asa Butterfield. These news from the Hollywood Reporter came as a surprise for me: I was expecting that only 2 actors were still in the race. From my point of view, I think that Marvel had already cast Spider Man a long time ago. Of course, rumors said a while ago that Asa Butterfield was in negociations with Marvel. My guess is that Asa Butterfield has been cast for the role of Spider Man and Marvel is doing what we know so far in the story because they do not want us to focus on who will be the third Spider Man to come on the big screen.  At the Marvel announcement last October, we knew that Black Panther will be on the neutral side in Captain America: Civil War. He could take the same place that had Spider Man in the Civil War of the comics. When we will see Spider Man for the first time on screen, we will go absolutely nuts. But when we will see Black Panther for the first time ever on the big screen, only people who read the comics with Black Panther in it can go nuts for all the time they want, but the general audience will not appreciate as much his first appearance in Captain America: Civil War. My opinion is that Spider Man will have a small role in this movie but not a larger one like Black Panther because everyone knows Spider Man and practically nobody knows Black Panther. I want everyone to know that Black Panther is someone you do not want to mess with: Marvel must develop properly his role in Captain America: Civil War. As of Spider Man, general audiences know who he is, so what is the point to make him have a big role in this movie?
UPDATE: Now that the 6 contenders to become Spider-Man resurfaced, there were down to 3 and then to 2: Tom Holland and Charlie Rowe according to some sources. And there is this site that says other actors could become Spider-Man and there is plenty more to count. I do not know how the casting of Spider-Man will (maybe) conclude because everybody are saying completely different things and the facts are not accurate. As of now, I am not trusting any site because I am bored to know that there are 6 actors, 3, then 2, then come back to 6 to go down to 2 and it can go on and on forever. I am tired of this debate: I am just hoping that Marvel Studios, Sony Pictures or the actor cast will tell us that Spider-Man has been cast.