Yeah hopefully it does well outside Jp.
Heres some info and non official gameplay video.
"Capcom's Monster Hunter 3 once again proved its dominance in Japan by selling roughly 500,000 copies in a single day, singlehandedly tripling sales of the Wii." (http://www.escapistmagazine.com/news/view/93730-Monster-Hunter-3-Debut-Triples-Wii-Sales-in-Japan)
"In a week where 6 games sold 50,000 units or more, Monster Hunter 3, Dragon Quest IX and Tamodatchi Collection were the biggest hits, with the first two in the hundreds of thousands." (http://news.vgchartz.com/news.php?id=4634)
Monster Hunter 3 demo gameplay vids: