JEvents 1.5 is close getting to a stable release and all the development and support effort is going into this upcoming release.
It offers a lot more functionality than Jevents 1.4 and has a handy migration mechanism. If you want you can even run Jevents 1.4 and Jevents 1.5 on the same joomla installation - just make sure that the modules don't get mixed up i.e. don't try to display a 1.4 module on the jevents 1.5 page and vice versa.
Looking forward to seeing you on Jevents 1.5