Updated models with AMD graphics options expected in early 2017.
Mac OS X 10.5.2 Soon? New Seed.
No announcements about Mac OS X 10.5.2 were made at Macworld, but one submitter noted that the requirements for Time Capsule had stated originally stated a minimum of Mac OS X 10.5.2, though this has since been changed.
Apparently, Apple hasn't quite finished working on Mac OS X 10.5.2 and issued a new seed just yesterday, addressing a number of issues. The latest build is 9C16.