The most important thing we can do is to keep the bitcointalk thread bumped for Jordan. We’ve seen in the past with Mercury that if the announcement can stay near the top of the Project Development sub-forum, it will slowly build awareness in broader communities. As long as we keep the thread active and interesting, I’m confident that places like /r/Bitcoin will begin to take note.
I would recommend against linking it to any other community forums unless you think there’s a specific reason to do so. Although the final project (B&C Exchange) will be relevant to many communities, at this point it is likely to be perceived primarily as an auction for NuShares. You’ve seen first-hand how Neucoin was received when they attempted selling themselves on community forums.
Edit for clarification: Jordan has some good thoughts on it. Reaching out beyond our community. I think there is “good outreach”, which is discussion of Nu activities on generalist platforms like Bitcointalk, and “ineffective outreach”, which is trying the Neucoin selling approach in concentrated communities like Peercointalk. That’s just my opinion however.