A new 32 minute video (NSFW) shows off gameplay footage said to be from Legacy of Kain: Dead Sun, a cancelled installment in the Legacy of Kain series (thanks VG247). This NeoGAF thread explains video and what else is known about this, described as the result of "years of research and connecting to sources," and an update notes a post purportedly from one of the game's developers. Here's a bit that provides a nice overview:

The video contains some of the opening story sequences, exploration, combat and an array of gameplay mechanics from Legacy of Kain: Dead Sun. The game was cancelled by Square Enix in 2012 after three years of development at Climax Studios, with Crystal Dynamics acting in an advisory role. The game was not projected to meet Square Enix sales projections, and was scrapped, to the enormous disappointment of staff who had dedicated a lot of work to the project. One source recalled that staff came in at weekends to continue working on the game, while higher ups already knew it was cancelled. The game had included a multiplayer component, an online asymmetrical deathmatch mode completely disconnected to the story and era of the single-player campaign. This was the only part of the project to survive the cancellation, and has now been heavily expanded upon and released as Nosgoth.