I was mainly interested in knowing when it was first announced. . .
If it goes back to the original kickstarter then it's something I either forgot about or mearly overlooked
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Any other info on the X-pack would be useful though as only announcing it probably won't be enough for some people (the way it's listed in the addon) I found this thread after a little bit of digging, but haven't read through any of it yet:
http://forums.obsidian.net/topic/64755-more-info-on-the-expansion-pack/