After beating Sanctus there's a DMC3 style sequence where you fight Scarecrows in the final boss room (That's where that scene of Vergil there in the trailer comes from), with a counter for how many you've killed and a countdown timer. It cut out at exactly 40, I'm not sure if that was the max or if the guy ran out of time, I feel like it might be the latter. Either way, he managed to get the Vante skin, though I'm not sure if that was tied to this or something else.
Anyway, the ending I saw was Vergil leaving Fortuna at night. I missed the first line or so because the subtitles were in Japanese, but the latter ones were Vergil saying things like how he'd surpass the Order's God and that they'd come to know his power in time. It reminded me of what he said to Sanctus in Deadly Fortune. As he's saying this, the camera pans out behind him to his shadow, which doesn't match Vergil's body. It looked like it could have been Nero's DT, Sparda, or maybe Nelo Angelo.
After that was the ending art, which looks to be unique and new for every difficulty. This one in particular was Vergil, captioned "I guess you're no casual, huh?".
I feel as though there may be a secondary ending depending on how well you do during the credits sequence.