IBM anounced deprecation of JACL support for wsadmin utility. Going forward it will support only jython as its primary langugae for automating WAS functions using wsadmin utility.
This has been anounced in its WAS 6.1 release, which means JACL will be supported for another 2 major releases of WAS from 6.1 after that (JACL)feature will be completely removed. Read more on here