Yodobashi.com have added a pre-order page for Kingdom Hearts -HD 1.5 ReMIX-, and this pre-order page details some of the gameplay changes made to the originals. Thanks go to bKvEBVAvUq for the tip, and to duckroll for some translations. The following images were added explaining this information:

Kingdom Hearts Final Mix changes:
- Character models and textures have been improved
- The "Zero EXP" and "Combo Master" abilities are added to the game
- The right analogue stick now controls the camera
- Summons has been moved to the 4th command slot
- The talk and special attack commands have been moved to the triangle button
- Trophies
- You can switch between English voices w/ Japanese subtitles, or Japanese voices
- Completing the game will unlock a custom PlayStation 3 theme

Kingdom Hearts Re:Chain of Memories changes:
- The graphical quality of the user interface and menus have been improved
- Trophies
- Completing the game will unlock another custom PlayStation 3 theme

358/2 Days inclusions:
- Over 2 hours of HD, fully-voiced cutscenes included
- All of Roxas' diary entries, the Secret Reports and the Character Database are included
- Watching all cutscenes will unlock *another* custom PlayStation 3 theme

And so I have yet another great reason to get 1.5.  PS3, prepare yourself, I shall exhaust you with KH 1.5!!!

so......is chain of memories having the card thing.........I dont care if they have it again, but i didnt like it but it is not a big deal cause it is fairly easy to learn (or so ive been told)

The change speech thing has been in KHFM already? Hasn't it?

So with the speech change being from English to Japanese shouldn't that mean that a over seas release would be sooner. Well ten again I guess they need to record voices for the days cutscenes but that shouldn't be that long. Can't wait for this game I'm sure it will get a world release date soon still can't wait.

0.o...yes

Really hyped about all this, but moving the camera with the analogue stick is always a pain in any game for me, sigh.

I wonder if the English VA option will have the lip sync that they always have, or if it'll just be a quick dub? 

so......is chain of memories having the card thing.........I dont care if they have it again, but i didnt like it but it is not a big deal cause it is fairly easy to learn (or so ive been told)

 

Unfortunately.........yes. lol

I wonder, does it really have the option to switch between English and Japanese voices, or was it merely referring to the fact that the KH FM contained in the ReMIX has the Japanese voices, instead of the English voices that the original Final Mix had... Hopefully the first

If it's a dynamic theme, that's great, it it's just a background change, then meh. Having a remastered version of Kingdom Hearts is a reward in itself!

It would be nice to hear Sora's cute english voice again from 2002

wonder if FM will still have the color-coded HP bar for all the bosses and enemies

The "change speech" thing probably means you'll be able to switch between Japanese voices and English voices (latter would have Japanese subtitles with it, obviously).Also is there just one theme unlocked after completing the whole collection, or three themes for each title after beating them?

There's a theme for completing KHFM, another theme for completing Re:COM, and another theme for watching the 358/2 days movie.