On the topic of future content:
We get info from TestLive servers. Those are open to everyone and as such there probably wouldn't be any problem with providing detailed info in advance. However, there are usually minor changes as it is when patch in question hits live servers (for example: minor changes to locations of NPCs, additional rewards...), so if you combine this with how devs might react to guides, we preffer to release (more or less accurate) info at times when it's too late for last minute changes
If you're that courious about new content, I suggest you get AOduplicator, create new toon (or copy existing one) to TestLive server and check it for yourself. If you're follow some basic ethiquete, I can guarante you'll be welcomed by community there, as well as you'll help get more smooth patch on live.