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There is no date that can be provided as to when a new RPC may be released. As you have noted, Oracle E-Business Suite Release 12.1.3+ Recommended Patch Collection 4 [RPC4] was released via Patch 21236633, and is currently the latest EBS RPC, released on Oct 21, 2015.
Thank you Leo for providing the information. Do you have any known issues after applying RPC4. Please provide us some information on this.