The release is mostly test suite additions. A new oci_client_version() function is available. This is useful for OCI8's test suite to overcome some of the limitations of PHP's simple test infrastructure. You might also find it useful in special cases where you need to know the exact version of the Oracle client libraries that PHP is using.
There are also some small internal code changes brought on by general PHP code cleanups. These OCI8 changes allow cross version portability for the extension.