Forum OpenACS Q&A: Response to Is Tcl 8.4.0 compatable with OpenACS?
AOLserver versions that include TCL 8.4. Roberto has just posted a
question about this to the AOLserver list (regarding internationalization specifically).
Check out Nathan Folman's AOLserver mailing list posting from a few days ago, which was also reposted on the OpenNSD thread.
I've still not heard of anyone who's tested OpenACS with the AOLserver 4 betas in any sort of normal configuration. (i.e. non-Windows) I'm a bit surprised by this, given that people are already discussing the need for an OpenNSD fork. (Although I'm the first to admit that it could be necessary.)