I don't know if anyone has already posted this since I was in Corfu Island in the last 2 weeks. It's from the JWN forum:
September 2011 KM says, "Publishers auxiliary pioneering during March 2012 will have the option of working toward a 30-hour or a 50-hour requirement for the month. Additionally, if the circuit overseer is visiting the congregation in March, all who are serving as auxiliary pioneers, whether with a 30-hour or a 50-hour requirement, are invited to attend the entire meeting"
I think this arrangements is about to become permanents in 1 or 2 years.