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The Update Rollup 2 for Windows Server 2012 Essentials has been released and is now available for download from Microsoft Update. You can read about the issues this rollup update addresses in Microsoft Support Knowledgebase 2824160.
The client-side package for this update rollup is installed on all client computers automatically after you apply this update rollup. The Update Rollup 2 client-side package is same as the existing Update Rollup 1 client-side package 2781268.
For more information, visit this link.
Tested it, UR2 installed fine, but if you had skipped the domain join when you originally installed your clients, you may wind up with remote systems unable to surf the web afterward. I wrote up the details:
Hope this helps others a bit.