SQL Server 2012 and DBM
There is a difference between - Features not supported in NEXT version of sql server vs features not supported in a FUTURE version of sql server.

Mirroring is still available in SQL Server 2012, 2014 and 2016. It has been put into the future deprecated list, but as of now, it is still available.

AlwaysON (as it was with mirroring when it was first introduced in sql server 2005) is an enterprise feature and in sql server 2016 (CTP2.1) it supports upto 2 nodes in standard edition as well.