The latest ez released yesterday contains a new feature to get the date when the user last loged in (Paul B. contrib if my memory serves me right). Don't remember if it's a new function or a new attribute on the curerent_user.
Once you got that, you can use that date to fetch forums post more recent and bingo, you know if it has been published.
Don't hesitate to publish the template once you've been able to do it ;)
