Just finished the update and have the same question. I think that it's the weakest cliffhanger that we have in a long time(start from 0.5)
Don't think that they meant ANY kind of deaths, 'cause in that case it should be say this way.
Also, 600 deaths in the world of the Eternum is not so much. You can call me cruel, but we have already witnessed 2 deaths. And you shouldn't be a genius to figure out that there were more. And now we probably know what type of cliffhanger to expect in 0.10 or 0.11(Someone will be logged out and have brain trauma, or even worse

. At least I hope that it will not be Alex



)
The only question that this update gives us is "who called us in the end" and is t the same person who told us to "find Calipso" in 0.1.