Namco Bandai recently set a site up to tease an announcement, and the game in question has been revealed. Jump Legend Biography—a compilation of Famicom and Super Famicom games based on various Jump series—is on the way to Nintendo 3DS in Japan.
The five games announced thus far include:
Dragon Ball: Mystery of Shenlong (AKA Dragon Power on NES)
Saint Seiya: The Golden Legend
Saint Seiya: The Golden Legend Final Chapter
Charge! Men's Private School (based on the SJ manga by Akira Miyashita)
Go! Go! Ackman 3 (based on Akira Toriyama's manga about a demon child that ran in V-Jump)
All of the featured games appear to be straight ports presented in their original aspect ratio.