If we release a Gallery 2.2.2, the following changes should be considered to be included.
Fix core upgrade notification in template
An incorrect variable name (which, sadly we don't get a warning for from Smarty) causes us to fail to see the notification that there's a newer version of the core available. And a quick review of the text shows that one of the bullet points is confusing/unhelpful so I removed it.
Fix for bug 1693956. The core.DownloadItem RewriteRule had a wrong rewrite target URL, it included the sessionId from configuration time. This could well break an embedded G2.2 (losing the session, not seeing non-public content, etc).