I don't
think the foundation owns the mediawiki logo. Copyright wise
it is in the public domain.
Hoi,
Given the age of the thing it cannot be PD yet. They are part of a
trademark and as such they are owned by the Foundation. They can if they
so choose license the logos. This is problematic because the rights that
are usual for other WMF content contrasts with the requirement of
maintaining the trademark.
No, the MediaWiki one really is public domain.
Whether or not it is also a trademark of the Foundation doesn't affect
its copyright status.
Angela.