The Official Playstation Site has updated featuring Kingdom Hearts Final Mix+ although it's probably not that major to us since it's the Japanese site and not the US, it's still worth a look for some small, yet more official screenshots of the latest scans.
• Playstation's FM+ Game Page

Final Mix

• Picture #1 Summary Translation: Sora vs. Roxas' battle is possible. The battle is playable that exist only in the event scene in Final Mix. The candescent battle can be easily felt.

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• Picture #2 Summary Translation: The new truth obvious: in the new additional cutscene. The event that supplements the story that's not explained in the original version. An individual story that is drawn more clearly, and is more finished than its original version.

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• Picture #3 Summary Translation: New secret movie is added in. The secret movie of the original version is added into the work now. The truth is clarified by the additional movie. Moreover, what kind of impact does the new content hold? It is a must see clearer movie than the original version.

Re:CoM

Nothing new here either. 2-D-->3-D CoM. Uses Japanese voices. Doesn't change the story at all. Etc., etc.

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• Picture #1 Summary Translation: In the process of making the GBA game to 3-D, more expressive character formation were added in. The power of expression in the characters greatly improve the same cutscenes from GBA to PS2. They are drawn delicately so when they are played out along with the voices, the scenes join in unison. Also, a new impression can be discovered by the 3-D characters' facial expressions.

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• Picture #2 Summary Translation: Two or more new elements are added in. Of course, the "Riku chapter" is possible to be playable after Sora's volume has ended too. In addition, two or more elements have been added in now with the battle with the Organization XIII that were fought in the original GBA version. It's been occassionally developed. Moreover, KH2 "reaction commands" are able to be used to attack in addition to the familiar "stock techniques" that are generated by combining cards. The strategy improves greatly. Also, there's a hidden element that'll help influence both "Final Remix" and "Re:CoM" so please expect it by all means.

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• Picture #3 Summary Translation: Battle scene to which, the action heats up! Since becoming 3-D, the battle field has become enlarged, and the guide is developed through a basic battle system (action that uses the card) which is the same as in the original CoM. Moreover, because of a lot of new cards added in, the battle has become bigger.

Source: KH-2.net for the translation and FF13 Vids