Well, that's what I am hoping to be wrong about, but I'm not holding my breath. I wouldn't put it past Capcom.
If its just Vergil taped on to that same crap from 2008, then that would be just sad but I wouldn't be surprised.
Capcom has made quite a few crappy decisions (cough, Megaman).
They also made the crappy decision of DMC2. However, look at what they did with DMC2. They listened to fan feedback and came back with an amazing game. I would assume also that they are behind DmC: DE, not just NT, and they pushed to get those additions in. They listen to fans so it means that care somewhat. I highly doubt that he would just be a skin for Dante, and if he was, I'd been sincerely surprised.
On another note...
My personal opinion on the matter is that we should be excited and expect something good, while also keep realistic expectations. A playable version of Vergil that is more than a skin (with his own styles, etc), some more modes, maybe an extra cutscene or two, and tweaking of certain game elements. I wouldn't say it's beyond possible for them to fix other things (give Nero more weapons, give Dante unique bossfights) if there were some leftover assets from the original production that they can polish up and finish or to give Vergil a small, unique campaign (a la Vergil's Downfall).
If Capcom really wants people to be happy though, they really should redo the second half of the game and give Dante his own unique campaign, explain things regarding Nero, and tying Vergil in with the DMC4 plot. This is likely stuff they'll save for a DMC5 (which is frankly a possibility in my opinion, and this re-release is to pump some funds into that project and create brand awareness).