Something that i seen during the most recent stream of DMC4, was the number of Lock-on options there where, which is very cool & is something i would like to see make it into DmC 2 if there ever is one. i would also like to see weapons have both an angel & demon mode, like the eryx for example could have had an angel form that made it similar to beowulf. i would like to see a bigger set of guns as well which was one thing i did like about DMC 2 and that was the submachine guns. i would also like to see a more robust training mode then the bare bones one that we got, in terms of story i kinda like the idea of this new Dante becoming the one we saw in DMC2, i think it could work the TGS 2010 video i think really highlighted that with it's atmosphere.
I would also like Kat to be far more Proactive and Smarter then she was, maybe now that both worlds have become one she can fight on her own now without Dante. i really feel she was nothing more then a stick for him to go after, why ? because tameem Said so. she is human so i get that maybe she could almost become like a lower class lady, like she could use guns, but in tune with her spell type spays that might be interesting.
i really think the story should take Place some years from this where Humans are well aware of the Demons and for some reason there behavior has been rather odd, in time this just means Vergil is coming back to take control and Dante goes to stop him only to be Defeated. when this happens he comes in contact with the Angels who where lead by his mother since they have been in hiding since Eva was killed, so they agree to help him and this leads to an all out war between Dante leading the angels and vergil leading the demons..that would be pretty cool. we don't know if there are any male angels in this world there might only be female angels so that would be sick.
even though i really dislike DmC i feel if given to a better team with a great story it could be up there with the older ones for me.
i still have a lot i would like to see but so far thats about it