The thing is ... Sega no longer owns dreamcast.com. Oh dear. While we have yet to obtain an English language statement from Sega, Japanese news site Mainichi has confirmed that dreamcast.com is no longer owned by Sega and is using the official Dreamcast and company logos illegally. Additionally, the current dreamcast.com domain registration information is also fraudulent. Engadget Japanese reached out to Sega for further clarification, and a representative stated that Sega is considering "appropriate measures." As we wait for further information, please (please!) do not submit any personal information to dreamcast.com. You've been warned.
Read - Mainichi.jp [Japanese]