I found a very interesting Japanese site that is supposedly keeping track of KH3D and regularly updating. And it says some very interesting things, though so far, I can only make out non-plot related details such as the explorable worlds, the names of Keyblades that are obtained in this game, and other lists of items, Dream Eaters, and whatnot.
Here's the link if anyone's interested in doing some translating, but do it at your own risk of potentially
major spoilers:
Æ’Lƒ“ƒOÆ’_ƒ€ƒnÂ[Æ’c3d ‹ÉŒÀÂU—ªƒfÂ[Æ’^Æ’xÂ[Æ’X
Anyway, this is what I found out just by glancing at it with my limited knowledge of Japanese:
As I figured, based on the magazine information, the seventh world in the game is indeed the World That Never Was. Also, apparently the player makes two separate visits to Traverse Town. So the order of the worlds goes like this:
Prologue
Traverse Town (1st visit)
La Cite des Cloches
The Grid
Prankster's Paradise
Traverse Town (2nd visit)
Country of the Musketeers
Symphony of Sorcery
The World That Never Was
This may not be a complete list, but according to the site, besides the Kingdom Key and Way to the Dawn, the Keyblades that appear here are:
スカルノイズ - Skull Noise (obtained during 1st visit to Traverse Town)
ガーディアンベル - Guardian Bell (obtained at La Cite des Cloches)
デュアルディスク - Dual Disk (obtained at The Grid)
フェリスギア - Ferris Gear (obtained at Prankster's Paradise, at least by Sora)
オーシャンレイジ - Ocean Rage (also obtained at Prankster's Paradise, perhaps by Riku?)
トドメナックル - Finishing(?) Knuckle (obtained during 2nd visit to Traverse Town)
オールフォーワン - All for One (obtained at Country of the Musketeers)
ファンタジーノーツ - Fantasy Notes (obtained at Symphony of Sorcery)