Those relese notes refer to suite b encryption for users who have purchased an enable the ACR or advanced encryption license. Those are typically government and highly secure installations. Most users do not have that license.
If you are not using termination, only your radius server needs to support TLS 1.2
If you are using Termination, TLS 1.2 support is enabled in:
6.4.3.3 - Released 7/24/2015
6.4.2.9 - Released 7/12/2015
6.3.1.x - Not released as of yet
The bug in the 6.4.3.3 release notes is below:
The versions above support TLS negotiation to 1.2, so they should support the latest IOS beta 9 and MAC OSX change.