Version 2 is "an experimental development branch for logging services designed for Java 5 and later." -- which in my understanding means, it was started several years ago (when Java 5 was new) and made no progress to date.
Better even the status of the 1.3 Branch: "log4j 1.3 development has been abandoned and no future releases or development is anticipated". The icing on this cake is the next sentence: "Users of log4j 1.3 are encouraged to migrate to log4j 1.2". No more questions, thank you.