This question is known to be posed by JWs to other JWs as an acid test of loyalty.
I'm not the first to notice what I'm about to point out and comment accordingly, but today I felt compelled to add a short article on my blog highlighting the new language that Governing Body member Geoffrey Jackson supplies as a response.
A person who honestly hesitates to respond with a robust "Yes!" now can say something completely deflating and with the authority of a sitting Governing Body member.
My article is titled Do you believe Jehovah's Witnesses' Governing Body is the "faithful slave"?