The article mentioned three specific bits,
1. The game will include a new exstensive feature, Gallery mode, including a full coverage of art work and illustrations, which can be unlocked during gameplay.
2. The game will feature more ending variations, presumably with new or different artwork, and bolder graphics. The U.S. version only had five different endings; the Famitsu quotes this number has been "increased considerably" for the Japanese version.
3. the game has three difficulty levels: Easy, Normal and Hard. Presumably this may introduce the new exstras, in addition to the new ending, alone each difficulty level could hold up to 15 differant endings.
Sadly Plans for a North American re-release of Metroid Fusion with the extra bits from the Japanese version are highly unlikely, although it may happen, but dont rais your hopes.