If you mean in the big render, that's most definitely Rebellion. If you mean in the picture with Trish behind him and he's got Yamato resting behind his shoulders, then yeah, that's Yamato. Considering that the main reason he breaks into the Order's chapel is to get back what they stole form him, most likely Yamato, that would be why has it.
Now we're just waiting to find out just HOW Dante got it in the first place.