Divine Shadow (and some other awesome people) at the Eidos forums found some more concept art for LOK: Dark Prophecy and Defiance, and some high quality stuff from Soul Reaver and Blood Omen 2.
You ready for this? Over 17 threads worth of new and improved stuff. I couldn't contain myself by the second link. 8D
http://forums.eidosgames.com/showthread.php?t=111810 - Soul Reaver- High-quality Melchiah model-shots/textures; early Lighthouse screenshots
http://forums.eidosgames.com/showthread.php?t=111743 - Soul Reaver - Turel - unseen face and body artwork, textured boss model.
http://forums.eidosgames.com/showthread.php?t=111747 - Soul Reaver - Undercity area screenshots and related concept art
http://forums.eidosgames.com/showthread.php?t=111796 - LoK: Defiance - Unseen environmental concept art (fountain, gates, artifacts)
http://forums.eidosgames.com/showthread.php?t=111795 - Blood Omen: Legacy of Kain- Video and screenshots from unreleased Sega Saturn version
http://forums.eidosgames.com/showthread.php?t=111744 - Soul Reaver - The Brethren and Melchiahim concept art, detailed Murals and textures
http://forums.eidosgames.com/showthread.php?t=111699 - Blood Omen 3 - Unearthed concept art for Ariel, Kain's Wolf Form, and female Razielim
http://forums.eidosgames.com/showthread.php?t=110614 - LoK: Dark Prophecy - More information unearthed (Malek & Devolved/Wolf Kain)
http://forums.eidosgames.com/showthread.php?t=111664 - Soul Reaver 2 - screenshots from cancelled PS1 release, Air Forge Design documents
http://forums.eidosgames.com/showthread.php?t=111695 - LoK: Dark Prophecy - Hylden-infused Sarafan armour renders
http://forums.eidosgames.com/showthread.php?t=111802 - Daniel Cabuco's Artwork
http://forums.eidosgames.com/showthread.php?t=111690 - Blood Omen 2 art unearthed - Unseen Hylden Castes, Mill sketches and Mecha Umah (wat) (Note: we all know that this was from Steven Ross' other game concepts, Chakkan and Sirens)
http://forums.eidosgames.com/showthread.php?t=111748 - Shifter - Initial concept art, very early protagonist and antagonist designs.
http://forums.eidosgames.com/showthread.php?t=111693 - Soul Reaver concept art discoveries- Three familiar (but high quality) and two unknown
http://forums.eidosgames.com/showthread.php?t=111866 - Soul Reaver Official Comic - Selected pages, precolouring, with artist's notes.
http://forums.eidosgames.com/showthread.php?t=111868 - LoK: Defiance (?)- Animation of unfinished Raziel wielding the SR1-style Fire Reaver
http://forums.eidosgames.com/showthread.php?t=111859 - Soul Reaver 1, 2 and "3" - GlyphX / Sandman Studios rendered images (HQ!)
Fangasm at will.