Finally, a trailer! I've been following newsposts about it but this is the first trailer i've seen.
As a Silent Hill fanboy I can losely piece it together. Spoilers if you haven't played Silent Hill 1+2+3 yet;
The storyline appears to be Silent Hill 1 orientated, with some elements of 3 mixed in. An adult (Harry in the game has been replaced by a woman in the film, she appears to be losely based on 'Heather' from SH3 with the boots and blonde hair) and daughter (Cheryl in the game, Sharon in the movie) go on a trip to Toluca, see a woman crossing the road (Alessa Gillspie, clearly a spirit in the trailer), swerve to avoid her and crash. When she (Harry-woman) wakes up she's in Silent Hill and Cheryl/Sharon is gone. It's snowing (curiously the snow is black in the film, white in the game) and there's heavy fog. The image of her chasing Sharon into the fog is lifted directly from Silent Hill 1. The female cop, Cybil is also there, as is Dahlia (curiously it seems she's been split in to two characters in the film; the middle-aged woman in the blue dress and the old woman with long, untidy grey hair. The monsters you see are;
Insane Cancer from Silent Hill 3
Demon Nurse (with rusty knife) from Silent Hill 2/3
Lying Creature from Silent Hill 2
C0ckroach from Silent Hill 2
Pyramid Head (!!!) from Silent Hill 2
The plummeting elevator (SH2), abandoned school (SH1,2 and 3) long steps to darkness (SH2), air-raid siren (SH2) and bleeding room (SH3) are both images from the game, as well as some images you see throughout the series, giant fans, rusty grating, filth everwhere etc. Also all the music in the trailer is from the first three games. I'm curious about the scene with all the people running away into the building, that's new. All in all this looks to be the best videogame-to-movie transition i've seen so far and i'm very excited about it indeed =D