Wikipedia's stated aim, to make information "freely" available, has no gender bias; it doesn't ask for it before serving its content - in marked contrast to other services (Google? Facebook? certainly the various ad services) which might structure their content according to a user's gender.
However, if Wikipedia has another aim - to make the scope of its content bias-free, then I think it has not thought it thoroughly yet: even structuring information as encyclopedia entries is inherently biased and restrictive (not necessarily bad though). Correlating Wikipedia's contributors' sex to an assumed gender bias in its scope (who gets to decide the articles' 'gender'?), as Wales does, proves how naïve such a project currently is.
However, if Wikipedia has another aim - to make the scope of its content bias-free, then I think it has not thought it thoroughly yet: even structuring information as encyclopedia entries is inherently biased and restrictive (not necessarily bad though). Correlating Wikipedia's contributors' sex to an assumed gender bias in its scope (who gets to decide the articles' 'gender'?), as Wales does, proves how naïve such a project currently is.