Older releases were GPL'd and they can't put the genie back in the bottle, so to speak. However, they could move any new Tcl code that might land in the repository that their employees have written under the new license.
Or they could bundle up a new ACS Tcl release and make it available only under the new license, in which case we'd need to avoid it.
aD's business interest is in the Java version, though, so I doubt if they'll take steps of this sort.
