It's been working like that for a long time -- several years, at least. I'm not entirely sure the mechanics behind it, but I think "Unknown leaves the guild" appears when the person who left doesn't have any more alts in the guild or isn't on your friends list. That my entirely observational hypothesis, which has no backing by Blizzard statements or anything. If someone out there has solid proof of how this works, by all means, do share. I'll update this question.
There is evidence that it also appears if the person deletes his or her character or server transfers, because at that point, the internal character ID (that you don't ever see) can't resolve and the system defaults to displaying that message.
I just ran the improved Shadowfang Keep last night and saw Godfrey and his goons that have died, what, twice now? Since the group wanted to plow through it could the Queue be gracious enough to let me in on what the "lore/story" is now with the Keep and what we are doing in there with the Forsaken?
Blizzard did not do a very good job here with its storytelling abilities, in my opinion (and the opinions of many). The lore is split between the worgen starting zone and the undead starting zone (even though the story is good). So if you want to see more, make an undead toon and play it through for a bit.
The story is quite great and raises some very interesting questions about Sylvanas and her future intentions. I won't spoil it, though -- spend a weekend playing through, and you won't be disappointed.
Where is Bastion of Twilight located lorewise? it clearly doesn't fit in it's instance portal so it must take you to some other dimension or something.
You're right, it doesn't really fit into the instance portal. But there is a suspension of disbelief you still need to have when playing WoW, and I think this is just one of those cases.
In terms of lore, The Bastion of Twilight is the base of operations for all the Twilight Hammer. Cho'gall is there, ruling like the boss he is.
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