Hi!
Maven SVN Revision Number Plugin 1.11 should be available from the Maven Central in a couple of hours. The plugin uses SVNKit 1.7.4 which supports both SVN 1.6 and SVN 1.7 working copies.
The plugin GAV is:
<groupId>com.google.code.maven-svn-revision-number-plugin</groupId>
<artifactId>svn-revision-number-maven-plugin</artifactId>
<version>1.11</version>
There are no changes from the 1.7 version (the previous "latest" on the Central) other than the support for SVN 1.7 working copies (due to switch to the latest SVNKit) and artifactId change.