All changes which should be noted are in the above release note.
And more: It passes all testcases for ruby-ossl for CRuby 1.8.7 except few classes which are not yet implemented like Cipher::EC. And I confirmed it passes all testcases of Net::SSH, httpclient, WEBrick, OAuth and rubygems except known issues which are 'wontfix'. (For example, JRuby-OpenSSL does not support 32bit DSA key which is not allowed in BouncyCastle. Key lengths must be 512-1024 and multiple of 64.)
This release supports JRuby 1.4.0+ but 1.5 is better tested. Please run your testcases against JRuby + JRuby-OpenSSL/0.7 and file a ticket at http://bugs.jruby.org when you find a problem. I think we can fix it at the next release.
It's the first release after I started contributing JRuby-OpenSSL. Thanks to @nicksieger for coordinating my commits and bad English to the release. It must be an annoying work. Also thanks to @olabini for creating this >30kloc sources for JRuby world. I bet no one can really understand what you did, except a person who understands Ruby internal and OpenSSL Toolkit internal. Great work, indeed.