Most large chain media stores will have it. As well as Funimation.
Kuroshitsuji: Season 2 was released in the US on DVD with English Dubs on April 3rd, 2012.
Kuroshitsuji II, though others call it Monoshitsuji meaning white butler.
No where, as of now. It will not be released in the US until April.
Yes and no. In Kuroshitsuji season 2 (Monoshitsuji) there are triplets who work for the Trancy manor. I do not know the triplets' names though. >_<
Kuroshitsuji Season 2, Episode 8; Divulging Butler.
The funimation website has them available subtitled as well as in english dubbed
You can watch it subbed on Youtube for free on the funimation channel. It came out in January.
You don't need a trailer for the second season. It's already out. But I put a link to a trailer at the bottom anyways.
Episode 16 (the end of the Curry Arc) is where the first season of the show deviates from the manga. The following episodes of season one do not take place in the manga. You can find the story continuing from the manga in Kuroshitsuji: Book of Circus, the third season.
Si Deus Me Relinquent, or "If God Has Forsaken Me".
No. Hayate no Gotoku is its own animanga and 2 years older that Kuroshitsuji.
It already ended...so you can go watch it now. They have all the episodes out, subbed too!