Two big items over 2.5A:
1) XPages plugin and DominoThreads now allow you to set the ClassLoader that will be used by the Factory. This prevents deserialization exceptions when working with custom classes defined in OSGi plugins or in NSFs
2) Fixed a bug with the org.openntf.domino.impl.Vector class which threw an ArrayOutOfBoundsException for an .add(int, Object) method that is valid in java.util.Vector, and happens to be used by the XPages DominoViewDataSource. The Exception prevents the rendering of XPages DataTables when linked to certain views.
These two issues together seemed worthy of a hotfix release.