Lead Developer
Hi Mizan,
Here’s the updates: http://generatepress.com/gp-1-2-9-released/
You can always check the changelog.txt file in the new .zip as well: https://themes.svn.wordpress.org/generatepress/1.2.9/changelog.txt
You can also look in our development blog: https://generatepress.com/category/development/
Hopefully WordPress adds the option to view the changelog before updating (like they do for plugins).