Kotaku.com have done some live blogging from Konami's Press Conference in Tokyo, Japan at this TGS07.
Katsunori Okita discusses a little about Silent Hill "Zero" Origins (Zero is the Japanese name for Silent Hill: Origins)and shows what is described as a new trailer, however IGN.com's description seems to be very similar to the E3 2007 and GC 2007 trailers which isn't too surprising since its meant to be out soon.
Kotaku:
«"The trailer runs, featuring our trucker hero driving, presumably hopped up on speed, having hallucinations to Akira Yamaoka music. Hopefully the new trailer is on the Konami asset media disc and that we should get after the conference."»
Kotaku didn't detail, but Silent Hill V was "briefly" mentioned and slated for a fiscal year (E.g. not before March) 2008 on the Xbox 360 and Playstation 3.