The inevitable happened:

- The Walt Disney Co. announced the changes Saturday at D23, a biannual fan conference in California.

- A similar land is coming to Disneyland in California, the company announced.

- The Star Wars areas will each be 14 acres – Disney's largest single themed land expansion ever.

- It will include what Walt Disney Co. CEO Bob Iger called "an epic Star Wars adventure that puts you in the middle of a climactic battle between the First Order and the Resistance."

- Another attraction will put guests behind the controls of the Millennium Falcon.

Disney Parks Star Wars-themed land renderings:

http://www.orlandosentinel.com/travel/attractions/the-daily-disney/os-star-wars-disney-hollywood-studios-20150815-story.html

I saw this coming from a mile away when Disney bought Star Wars. :D

Is is a whole new park or just a section of an existing park at Disney World?

It's a new one, the largest themed area ever.

The article made reference to the previous Star Wars-Disney relationship, even before Star Wars being bought:

Even before Disney bought Lucasfilm and took control of the “Star Wars” franchise in 2012, the two had a long relationship through Hollywood Studios. Star Wars Weekends are a big draw. Children can attend a Jedi Training Academy there, engaging in lightsaber battles with Darth Vader.

https://www.youtube.com/watch?v=d5mK7dzyUkM

In 2011, Disney revamped Star Tours, one of Hollywood Studios' original rides, which takes visitors through key movie scenes.

Awesome, looks like I'll have a reason to go back!