XBOX announced most games at E3, but will they actually make them?

Do a search and you'll see what happened, I believe it will still be released but probably not until 2016.

[quote user="Wikipedia"]

At E3 2014, a
Phantom Dust remake was announced for the
Xbox One. In 2015 the development studio working on the game shut down. Microsoft indicated development may proceed with a different team.

[/quote]
I'm assuming that's the reason why they're delaying on the release of that game. Also, I doubt they would announce games that they wouldn't release, gameplay is enough proof that the game exists, and will be released. There would be no point in making
a game, if they do not release it. And I do not think they will stop development of a said game without a valid reason to it.
This quote is from a recent interview in regards to that game:
[quote user="Microsoft's Aaron Greenberg"]
It has been a passion project for Phil and a lot of folks on the team and we are currently exploring what we are going to do in the long term. The project is not canceled. We don't have an active developer on it right now

It's a project that like many things will take a little more time but at this point we are not giving any more updates on it.

[/quote]

I could definitely see them making some game improvement announcements at E3 though.

Microsoft had reached a deal with Mojang to port the game to Xbox 360 just one week prior to E3. At the time of the announcement, no code had been written. It was all extremely new. The graphic for Minecraft on Xbox 360 was actually completed the night
before E3. At the time of the announcement, many at Microsoft didn't even know what Minecraft was. We should understand the 2011 E3 announcement from that context.

Looks like Nyko was the first to announce they are making cases.
www.engadget.com/.../nyko-gaming-accessories-e3 but their site doesnt have them yet.