A Geeky Viewpoint

Chadwick Boseman

1) Ant-Man is the final film of Phase 2. 
This is different than originally announced where the Avengers Films would be the end of the Phases.   In this case Ant-Man will take place at roughly the same time as Avengers: Age of Ultron and the events of Avengers: Age of Ultron will not affect the Ant-Man story line.

2) Chadwick Boseman will star as T'Challa the Black Panther.
He will appear in Captain America: Civil War (May 6, 2016), The Black Panther stand alone film (Nov 3, 2017) and at least one of the two Avengers: Infinity War (May 2018 and May 2019).


Carol Danvers - Captain Marvel

Chadwick Boseman contract is for 5 films over the course of phase 3 and phase 4.

3) Kevin Feige dream of Captain Marvel (Ms. Marvel) and the Inhumans
films are both on the docket for Phase 3.
To me this is the biggest surprise and in a way has to do with the success of Guardians of the Galaxy.  Its not surprising they wanted to both films it is surprising they are doing both films.  
It also pushes some potential films (Iron Man 4) off the docket until at least Phase 4.

4) The third Avengers film is indeed a two part deal.  I have heard this rumor for months and many fans weren't buying it.   Back in October  I finally got off the fence and decided it made the most sense.
Many of these same rumors are suggesting that there will be two distinct Avengers teams involved in these films.   Nothing presented is going to slow down this kind of speculation, rather the reverse may be true when Kevin Feige stated.

"It’s like as it was in publishing, when each of the characters would go on their own adventures and then occasionally team up for a big, 12-issue mega-event. Then they would go back into their own comics, and be changed from whatever that event was. I envision the same thing occurring after this movie, because the [Avengers] roster is altered by the finale of this film."

The current rumor is that Captain America (Chris Evans) will be assembling a different team of Avengers at the end of Avengers: Age of Ultron.  

The Hulk and Black Widow share a moment

5) Hulk and Black Widow are not currently slated to get their own films.
Here is my take and I know more than a few fans will be upset at this: Both characters are perfect supporting characters in the Marvel Cinematic Universe.   These two characters do not necessarily lead themselves into leading roles in the cinematic universe.   With Hulk, the 2008 Incredible Hulk movie was as good as it can be for him as the leading role and it didn't work.
Both Hulk (Mark Ruffalo) and Black Widow (Scarlett Johannson) will be in Avengers: Infinity War and additional films during Phase 3 and will have very important roles.

6) Guardians of the Galaxy II is moving into the slot for 2017, May 5th.
There can be little question about the success of the first film having passed Captain America: Winter Soldier and X-Men: Days of Future Past in the box office both domestically and world-wide.

7) Marvel Studios and Marvel Entertainment clearly thumbed their noses at their collective competitors.  They dropped Doctor Strange one week before Sinister Six (Sony/Columbia), Thor: Ragnarok two weeks after Fantastic Four II (20th Century Fox), Black Panther two weeks before Justice League Part I (Warner Brothers/DC) and Avengers: Infinity War Part 1 one week before The Amazing Spiderman III (Sony/Columbia) soft date.
Marvel's competitors have all previously announced their films in comparison to Marvel just announcing a series of dates, this is like poker you don't mess with the player with the big stack.   I am guessing more than one of these competitor movies are going to change dates.    

Spiderman

8) Kevin Feige didn't specifically rule out crossovers with Spiderman (and Mutants).  When asked
specifically about the Spiderman/Sony rumors he responded "Anything that wasn't specifically and obviously revealed today is either not true at all, or still rumor until it's worked out."
Marvel, specifically Kevin had ample opportunity to slam the door closed on Sony, but didn't.  To me this is suggesting that Marvel has placed the ball in Sony's court so to speak.

I should point out that Kevin was asked about Benedict Cumberbatch and he responded "If he was signed to the contract we would have had him here today as well."

It's important to realize that Marvel Studios and Marvel Entertainment is currently in a position of strength in comparison to their competitors.   The Sam Raimi trilogy of Spiderman movies and Nolan's Batman Trilogy were extremely successful, the X-Men films have had moderate success, other comic based movies have been only marginally successful if they were lucky.  In comparison to the success that marvel Studios has had the current slate of competitor films are like pouring a gallon of water into a Olympic sized swimming pool and wondering how much did it increase the water level.   
The problems of the Amazing Spiderman Trilogy has placed enormous pressure on Sony for finding  success with the Sinister Six, as it is the only way to make a Spiderman centric Universe work.   Sony knows it cannot compete directly with MCU so its going to have to movie further weakening Sony's position with Marvel.