Devil May Cry 5 has garnered both fan adoration and substantial critical acclaim, and there have been theories about the sort of expansions the game might receive post-launch, but the truth of the matter is - there's nothing new coming for DMC 5 at all.
Devil May Cry 5 DLC was never in the cards, according to Matt Walker of Capcom, one of the lead producers working on the project. In one fell swoop, he shot down two of the biggest rumours surrounding post-launch content for DMC 5.
When asked via Twitter about the rumoured Vergil expansion for DMC 5, Walker said that there aren't any plans in place to produce more post-launch content. The rumour about Devil May Cry 5 Vergil DLC was kickstarted when dataminers found that, with some effort, they could jury-rig Vergil into a playable state already, just using what files are available in the base game.
Similarly, Walker was also asked about the Devil May Cry 5 Ladies' Night DLC, which was supposedly going to feature the female cast of the game in playable form, though Walker put these to rest, too: "Unfortunately dev on DMC5 is finished. I'd personally like to see the ladies playable too. We can only hope that at some point we can convince the people up top that it's worth doing."
The fact that there's no future official content releases planned for DMC 5 might be sad, but given that the game is available on PC, there's no reason why you shouldn't turn to modding instead. Game Watcher's Devil May Cry 5 Mod Database is quite substantial already, and will let you do all sorts of stuff, such as give Nero the Devil Sword he deserves, turn Dante into a woman, and have V look like Shaggy of Scooby Doo fame.