Whatever DMCV is, I'm sure it wont be DMC4 Again Edition(which was DMC3 Again Edition). They put that franchise on ice because it fell into a creative rut and frankly wasnt that popular. If they're bringing it back, I'm sure its because they have some new ideas on how to evolve the franchise and get people excited about it.
Neither are true. DMC was absolutely popular back in the day, and the reasons for the reboot are well-established. Itsuno himself wanted to do 4SE and 5 after 4, but Capcom wanted to pursue the reboot direction already before they had even talked to Ninja Theory.