The new blog entry advertises version 1.2.0 of the native desktop app:
http://www.mattermost.org/category/blog/
and it links to: https://github.com/mattermost/desktop/releases/tag/untagged-2c729d2099b233684a20 => 404
The official download-tab on mattermost.org was my next move: http://about.mattermost.com/downloads/
But it links directly to version 1.1.0 (old version)