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In resume: Yes, Obsidian is thinking making the second part.
Obsidian’s CEO Feargus Urquhart:

Eternity II is not announced, [but] it seems silly for me not to acknowledge it, though. If someone asks: “Are you working on it?”, I respond: “Well, wouldn’t you work on it?”. So then they say: “So you must be working on it”, and then I’m like: “Well, yeah”.
http://www.gamepressure.com/e.asp?ID=712