Usually by this time of year, the buy-up covered us through the following preferred year (in this case, it would be February 2016). But the web site is still showing that a buy-up now only is good until Feb 2015.
This makes me believe that the "new and improved" combined DM/AAdvantage will not offer this (as AA does not now).
Wouldn't be surprising, I think a lot of folks speculated that the programs wouldn't combine for status purposes until after buy-ups had worked their way out of the system.