I remember that when Vilgax turned Malgax, after the incident with Vilgax turned int a statue, it appears to be that some of the material of Malware was moving and coming out from Vilgax rests. ¿Will Malware return in a new series of Ben 10 that follows the canon of the story? ¿Will it be possible?
Considering the original continuity has been put to rest, we'll never get a definite answer.
Yeah, that's sadly true. I honestly think they could have continued it but doesn't look like that's happening. Maybe someone did a fanfic that's worth reading, but nothing official is coming anytime soon.