There is always a changelog and news about the new version here: http://www.aquoid.com/news/
and the announcement of the automatic update always gives 2 options:
inspect the update (left option) or automatic update (right option)
the left link will bring you to the wordpress-theme-site and there is a link to the theme homepage as well:http://www.aquoid.com/news/themes/suffusion/
so you can find the info before automatic updating, have a try!