Adobe Flash Player -- What is the last date or version for Adobe Flex backward compatibility

What is the last date or version of Adboe Flash Player that will be tested to be backward compatible with the Adobe Flex SDK?  When Adobe announced that Flex SDK would be provided to the Apache Community, the announcement indicated that Flash Player would be backward compatible for five years.

The snippet from the Adobe announcement in ~2011 early 2012.  We are looking for the Adobe Flash Player version which will no longer be tested for backwards compatibility in order to drive an internal project funding and timeline to migrate to Apache Flex SDK.

Thanks!

Jim

Adobe runtime support of Flex

Flash Player 11.2 and Adobe AIR 3.2, which are anticipated to ship in the first quarter of 2012, will be tested with applications built using Adobe Flex 4.6. Adobe will test future releases of Flash Player and AIR against the Adobe Flex 4.6 SDK and maintain backwards compatibility for five years.