I wonder how long they are going to be using the "Unity" name, given that there exists another engine which has had the trademark name "Unity 3D" since 1999 or so... Don't people do at least a little basic research before naming a product?
This engine has been sold commercially since 2005. I can't even find any reference to the other engine you mention.
The other has been used since 1999. http://en.wikipedia.org/wiki/World_War_II_Online
EDIT: appears to be USPTO trademark reg # 75824303, filed on Oct 18, 1999.