~Links~
Yes, Sora's Heart does look official, but it's really a fan-site =)
Visit the official sites below:

• Kingdom Hearts II Official Website (NA)
• Kingdom Hearts II Official Buena Vista Website (NA)
• Kingdom Hearts II Official Website (JP)
• Kingdom Hearts II Official Disney Website (JP)

• Square-Enix (JP, NA & EU)
• Disney (JP)
• Buena Vista (NA)