I personally don't need another, new HD collection (even though I sold my 360). If I want to play DMC3, I'll try it on PC. I also don't see an HD collection for PS4 happening. Not ever. It'd just come too soon after the previous HD collection to truly be profitable and popular.
What I'd love to see is a remake of DMC3 -- but it doesn't have to remake the story or anything like that. DMC3 seems fine to me, it fits within the overall timeline of the series, and I think it only had one plothole. It'd be great to have DMC3 with PS4-quality graphics, a soundtrack with some more interesting combat themes maybe, style switching, and some extras if there's still room for them.
It's a shame, though... 2015 would've been the 10-year anniversary of DMC3, so it would've been a good year for a remake. It turned out to be DMC4 SE, which is still good though. After everything that's been said and hinted at, we can at least expect DMC5 to be developed at some point, and that's honestly what I'm waiting for.