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The twitter account is available from CKM's Help menu.
GitHub
Likewise, for the more technically minded, some CKMs have a GitHub account linked to it, where updates to archetypes and templates are automatically mirrored.
Go to Help/CKM Git Repository to open this.
RSS
Yes, you can still follow the RSS feed for new and updated resources if you like.
For example, the RSS feed for the international CKM instance is available from: http://openehr.org/ckm/getRSS
The Left-Hand New and Modified Resources Tab
You can also just look at the left-hand new and modified resource tab, where you also adapt the start date if required.
The New CKM Dashboard
The new CKM Dashboard has a News Section where all the latest changes and additions to archetypes and templates are listed.
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