Speculation?
OK, I'll bite:
My crystal ball says no major changes. Only thing I see is a major targeted buyback status letter in January for those who decreased UA flying (regardless of the reason... AA match, UA failures, etc.).
My gut says it will be free if you flew high fares and had little or no (under 25K) flying with UA this year. It will be a pay to play (500-1200) if you qualified for 2P or above for 2013.