The changes will be available in the changelog here for those with manual edits on the theme: http://www.sitesplat.com/phpBB3/changelog.php
For those with only changes on custom.css, just make backup of the file and then reupload to the same spot on the new theme folder (or copy the content and insert it again on the ACP for those using MiniCMS that dont know where the file is) and thats it.
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