I think I've mentioned it before, and I don't have too much in my head right now, other than some basic points, but here goes...
DMC5 should be a total nod to the series as a whole, and possibly the best way to let it go out with a bang. It should have two full sides, a la DMC2 (
not DMC4). According to the Bingo's novelization of DMC4, after the events of the game, Nero started his own Devil May Cry to hunt for demons, but DMC5 should focus on actually telling us about Nero's origins, and thus most of Nero's side should comprise him searching for information
on his origins, and ultimately learning how he's connected to Sparda. In the process of this, he would learn of inklings that the demon king Mundus is mounting a revival in Hell, which her learns of because he holds the true key to the demon world; Yamato, which demons have begun to seek out. This is all happening around the time that Dante is fighting Arius's forces in DMC2. Requiring some much needed help, Nero seeks out Dante, only to find Lucia waiting for his return, and here, Nero learns that Dante hasn't been seen for a while after he went to Hell - Nero knows what he's going to have to do...
On Dante's side, we've last seen him in DMC2's ending driving around Hell in a motorcycle, popping sweet wheelies into the sunset. Stuck in Hell, he's forced to fight off the demons that are still around, and in the process he is shown much of his past. The demons will pull at his memories, showing him things that players haven't known about, fleshing out Dante's character more, and even trying to explain his shift in mood between DMC4 and DMC2. Levels will be comprised of new places, as well as some old favorites as nods to his past exploits, like portions of Temen-ni-Gru and the castle on Mallet Island. We'll also get to hear more about a shifting leadership among the forces of Hell, as some demons who were sympathetic to Sparda have finally been able to stand up since Mundus was no longer around to silence them. So, Dante's story is comprised of his memories, learning more about himself, Sparda's legacy, and helping a sympathetic demon army rise against Mundus' remaining forces that are attempting to revive him. It ends up sort of like a reversal on the war for the throne we all know that got Lucifer and his followers cast out of heaven.
In the end, both sides culminate in Nero using Yamato's power to break open a seal to Hell, arriving fashionably on time to help Dante in the main assault against Mundus' forces. In the end, we've got Dante and Nero fighting against the newly revived Mundus, putting him down for good, and ending the series on a high note, where we know
everything, and people can go out knowing they just experienced one of the craziest DMCs ever, and then go even crazier in Bloody Palace as Dante or Nero, or
both in a co-op mode.
Gameplay features...I haven't thought of yet, but ChaserTech had some great ideas on that front
I do think they should keep something similar to DmC for some of the controls, which...is really just making Dante play a little more like Nero, so that Aerial Rave and such are all on the same button