Can you direct Availability Groups to fail over to a particular node?
Windows Server Failover Clustering (WSFC) with SQL Server does have the option to failover to a particular node and Availability Groups seem to build on WSFC.

Taken form the MSDN:


  Preferred owner A node on which a resource group prefers to run.
  Each resource group is associated with a list of preferred owners
  sorted in order of preference. During automatic failover, the resource
  group is moved to the next preferred node in the preferred owner list.


http://msdn.microsoft.com/en-us/library/hh270278.aspx