The W3C halted work on the Arena browser, and switched to the Amaya browser as their new testbed. Yggdrasil Computing then took over the role of developing the browser. Development seems to have stopped in late 1998, with the final release being on the 25th of November.
Despite its time of development, Arena is in certain areas a relatively modern browser; because it functioned as a testbed, it saw the implementation of new technologies long before they became mainstream.