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That is a thing that makes me question it. Forking is a great aspect of mailing lists that's missing on forums. On regular forums offtopic turns topics into a mess. On stackoverflow I don't see offtopic. I'm a noob there, so I don't know how things go with it, but I suspect that it's not flourishing into new discussions as easily as on a mailing list.
1) Split the community. I suspect there wouldn't be many people who regularly post on both ..ehm..'forums'.
Announcements on mailing list won't reach stackexchange exclusive audience. I haven't seen stackexchange used for announcements, but posting announcements there as well as on the list might be an option.
2) Drive some new people to the community, on stackexchange side.
BTW, another option is to put a link to http://stackoverflow.com/questions/tagged/lua as one of places for discussion on the Lua site.