I can definitely attest to the fact that the 10 hour rule is still in effect. I know, because I recently lost the "privilege" of reading the WT on Sundays and carrying mics around (I'm not a MS or elder). When I was informed of this the elder told me it was because I wasn't meeting the congregational hour average. I asked him what the quota was and without blinking he said 10.
For a while I was thinking of putting some fake time in to bump up my hours. I actually didn't mind being a mic runner because it was a distraction from the boring meetings parts. I couldn't bring myself to do that though, just felt wrong.
To be honest, I'm not sure what the goal of taking away my "privileges" was. Is it supposed to motivate me to increase my hours? It's actually had the opposite effect, because now it makes it easier to miss meetings knowing that I have no responsiblities to care for.