There have been a number of Linkscape updates since September and each of them is generally accompanied by a blog post (sometimes more than one) providing data and explanation of changes in methodology, new features etc.
The Linkscape Update Schedule provides a calendar of planned releases for the future.
The most recent post on the Interim Linkscape Update for January provides information on the release which occurred less than a week ago.
The October Linkscape update brought with it new features for Open Site Explorer.
November saw two LInkscape updates - this one in the first week of the month and the second in the last week of the month.
This post on updated Page Authority & Domain Authority explains the significant changes in the calculation of these metrics which were introduced with that second update in November.
If you want to keep up with future updates the easiest way would be to subscribe to the RSS feed for the SEOmoz Daily Blog ...then new posts will come straight to your inbox or reader when updates are released. Another option is to follow @SEOmoz on Twitter as updates are always notified there.
Hope that helps,
Sha

