Of the films mentioned ,Doctor Strange is the only one we hadn't heard about until now.

If you've been hoping that Doctor Strange would definitely get his own movie, your prayers have just been answered.President of production at Marvel Studios, Kevin Feige, wants fans to know that his eyes are already set beyond Marvel's Phase II of movie releases. That's saying a lot, considering Phase II includes but is not limited to Iron Man 3, Captain America 2, Thor 2, and Avengers 2. That's a lot of meat and potatoes Marvel, but what's missing is the new and the different. In fact, Phase II's only quirk will be coming in the form of Guardians of the Galaxy.

But Feige wants more and so do we. That's why he's been opening up about Phase III which will include, you guessed, it Ant-Man and Doctor Strange. On the subject of Ant-Man, Feige emphasized that it's all about director, Edgar Wright.
Ant-Man is definitely part of Phase Three. Like Iron Man 3, it's certainly set in the Marvel Universe, but it's also through the lens of Edgar Wright, which is the only reason we're making the movie.
Wright, who apparently has been asking about Ant-Man as far back as 2004, has a signature style he brings to his films. Whether or not it will be the right fit for Ant-Man remains to be seen, but Feige clearly has every confidence it will.

As for Doctor Strange, Feige is excited for him, too.

He's a great, original character, and he checks the box off this criteria that I have: he's totally different from anything else we have, just like Guardians of the Galaxy.He's totally different from anything we've done before, as is Ant-Man, which keeps us excited.Excited, indeed. Phase III sounds like it's going to take a few risks and that sees us just fine. It'll be exciting to hear what else will be announced.