Even though its not a ‘omg its real’ find, someone at NeoGAF did a whois search for Valkyria3.jp and it turns out its owned by SEGA. SEGA buys names all the time, but sometimes we find out about upcoming games by what domains they buy.
Take for example Sonic Colours (or colors) was found due to a domain. So I guess it does happen, but that is why its always filed as a rumor. I hope if its true, its on PS3.Ad: