I've noticed there are 2 announcement forums, 1 for pre-orders and 1 for non-paid members.
In order to get more people interested in making that purchase, it might help if you let them have access to the same announcements the pre-orders can see. It helps them to see that things are constantly active and would possibly bring in more players.
I say combine the announcement threads into 1 and let them know what we know about updates.
I really haven't seen anything at all in the pre-order announcememnt area that all the other subscribers to the forum shouldn't be able to see.
Also, we copy/paste the info to the them a lot anyway when they start having doubts that the devs are active.