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After releasing the shocking trailer during Sony's E3 conference confirming the return of Jack Sparrow and the rest of the POTC gang, Square-Enix also revealed that the 'Pirates of the Caribbean' world, called 'Port Royal' in KH2, will instead be called 'The Caribbean' in 'Kingdom Hearts III'. In addition to that, the world logo as well as renders for Sora, Donald, and Goofy from that world have been released. Check 'em out below:
Updated with higher quality renders:

EDIT:

Even MORE renders:

Update (and edited): The limited edition that includes the PS4 Pro will include Kingdom Hearts III, and DLC for a special keyblade, and a special theme (likely the same included with the digital download preorder of Kingdom Hearts III). This version can be found on the Japanese Playstation page (but doesn't include preorder information). The price for this is ¥ 53,780 + tax. This is ONLY for Japan, currently.

Original:
We weren't kidding when we said Sony dropped a lot of Kingdom Hearts news! After all these Kingdom Hearts games... we're finally getting a Kingdom Hearts 3 PS4 (Pro) in the West (we're assuming since they announced at at E3).

Unfortunately, nothing else is known about it, so we'll have to let you know when we know more!

EDIT:

Here's what the special theme mentioned above will look like:

Update: There will be TWO versions (of sorts) for the All-in-One package deal. The first is a digital download version which can be currently preordered from PSN. This costs $99.99 and includes Kingdom Hearts 1.5+2.5, Kingdom Hearts 2.8, and Kingdom Hearts 3 (when it becomes available). This version will include a theme and a Star Seeker variant keyblade (for Kingdom Hearts III). A picture of the theme has been linked below thanks to Pixxz on Twitter


The second version is a physical version, which seems to be Japan only for right now. This version includes physical copies of all the Kingdom Hearts games, the artbook from the special editions, the theme (shown above), and an original box. This version will cost 19,800 yen (tax included) and can be found on the Japanese Square Enix Store
Original: The Sony E3 Showcase had a ton of surprises for Kingdom Hearts! And it looks like all the Kingdom Hearts game within one package is one of them. From the looks of it though, it looks like it's only coming to PS4 (sorry Xbox fans
:( )

Unfortunately, we know absolutely nothing else about it yet. We'll be sure to let you know when we know!

During Sony's E3 conference, the final of the three 'Kingdom Hearts III' E3 trailers was revealed, confirming the return of Port Royal and Luxord, as well as giving us our first look at Kairi and Lea, and many more surprises. Check it out below:
EDIT:

Added Japanese version as it contains an additional scene with Lauriam/Marluxia:

As evident in the time table above provided by Square-Enix, Kingdom Hearts will be featured in their annual E3 livestream, with 'Kingdom Hearts Union X[cross]' being the focus at 10:30 a.m. PDT, while 'Kingdom Hearts III' will be featured at 3:00 p.m. PDT. While their appearances seem to just be gameplay/demo related, there is always a chance Tetsuya Nomura might make an appearance to discuss further developments with these two games.