The 3DS remake of the Wii's Unlimited Cruise titles feature more than just 3D graphics.
http://www.nintendoworldreport.com/news/24751
The first new details about Namco Bandai's Nintendo 3DS compilation/remake of Wii's One Piece: Unlimited Cruise 1 and 2 have been revealed, in latest issue of Weekly Shounen Jump. Announced in December, Unlimited Cruise SP will contain two new characters: Boa Hancock and Emporio Ivankov.
The article also lists some of the content that will be returning from the original two titles. The fishing and treasure hunting modes will be retained as will the character Gabri, who was created specifically for the original Unlimited Cruise titles.
One Piece: Unlimited Cruise SP is set for a Japanese release this spring.