Thanks, Dyre. You mentioned some changes to the properties.dir property, but I can't find them in the patch (only the changes to ReleaseProperties.java are there).
I think the changes look good. In order to clear up the potential confusion of having two constants with almost the same name, what about collapsing them to a single constant declared like this:
private static final String APACHE_LICENSE_HEADER = (
"# Licensed to the Apache Software Foundation (ASF) under one or more\n" +