who would own their IPs now? Unless I'm remembering incorrectly, they went out of business rather than got taken over so in theory they might still own their titles but at least 2 I can think of off the top of my head have other licencing issues, Temply Of Elemental Evil would need negotiations with wizards of the coast and Vampire The Masqerade Bloodlines would need negotiations with White Wolf or whatever they're called now that the evil icelandic menace has taken them over.
That said, I'd buy Arcanum in a heartbeat and Vampire Bloodlines in another (possibly final) heartbeat. Hell I own Bloodlines already but I'd just like the convenience of a single EXE rather than 3 CDs.
I'd not object to Vampire The Masqerade: Redemption either, that was a pretty good game.
I think that Activision would own their titles, since they were the publishers. At least for Bloodlines.