Cloudera publishes Kudu binary packages in accordance with the internal release cycle. Per company's policy, we don't promise any particular dates for features/builds availability.
However, there are binary packages of Kudu 1.3.0 in the Cloudera's repository. Even though our binary says 1.3.0 it may include backports that were included in the upstream 1.3.1. When it comes to bugfix patches, we often include backports that aren't in the exact upstream release. You can find package repos URLs at the https://www.cloudera.com/documentation/kudu/latest/topics/kudu_installation.html page. It might happen that the patch you are looking for is in cloudera's package v1.3.0 already. For details, please take a look at the release notes: https://www.cloudera.com/documentation/kudu/latest/topics/release_notes.html#relnotes_1_3_0
Is there any specific feature/patch that you are expecting with 1.3.1 release?