Every Friday when the Test server gets patched update notes are posted here. A few weeks before every live event a detailed content list is posted here by Kaitheel. These are the things the devs would like us tp work on. What more do you need to know?
Since this forum posts the patch notes, and the live event feedback/bug requests, we don't often use the MOTD to request eyes on those things. I've updated it a couple times when we've got a really short window for a new event quest or something, but as we're juggling everything else, we rather hope the testers will be self-motivated to see what's posted here that they feel up to testing.
If nothing else, anyone who's been on Test for a bit would probably have heard us mumbling about the next holiday coming up, often with groans of how often they're piling up! That is definitely one thing we jump on beforehand, though personally, I'd like us to be more of a go-between stage betwixt Beta testing and Live release... Uwk