2013 plan announcement date and effective date?

Hi -

Any idea on when 1) the 2013 program will be announced, and 2) devaluations of already-earned miles (via greater mileage requirements, diminished availability, etc - if these even occur) are likely to take effect?

I'm trying to decide whether to use the ~50K miles in my account now, or wait until the booking window for early 2014 opens up in early 2013.

Thank you...