Waz -actually it's WΔz: the A is indeed a Delta symbol so it's pronounced Was or W-Delta-Z depending your mood - is an upcoming thriller directed by young director Tom Shankland. The movie should be released in February 2008 in the USA.
Here the trailer:
"Bodies are beginning to be found in the dark city streets yet there is something horribly wrong with them. Some are mutilated while others have an equation wΔz = Cov (w,z) = ßwzVz carved into their flesh. As Detective Argo (Stellan Skarsgård) and his new partner (Melissa George) begin to unearth the meaning of the odd equation, they soon realise that each victim is being offered a gruesome choice: kill your loved ones or be killed yourself." (Source: Official Site)
What a scary choice!