A whois search for gundam-unicorn.net reveals Sunrise has registered the domain. Thanks to Deacon Blues for the news.
Note this doesn't necessarily mean an animated production is in the works as Sunrise also runs websites for manga such as Delta Astray and Musha Maruden as well.
http://whois.domaintools.com/gundam-unicorn.nethttp://whois.domaintools.com/delta-astray.nethttp://www.sunrise-inc.co.jp/musha/