I'll copy the message and translate:
Inactive forums shall be removed.
From now on, a forum which did not get new posts in 30 days will get on the list to be removed. A mail will be send to inform the forum administrator that the forum will be removed in 10 days, unless in those 10 days new posts/replies are made.
After 40 days of no posts on the forum, the entire forum will be deleted. (The script will be kept for 41 days, to give one day extra.)
Please pass this on, especially to members with inactive forums.
So... just an important headsup to us all. If I ever happen to be without internet a full month (which VERY well might occur in the future; think vacations and such) I should appoint someone to keep an eye here I guess.