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The first new account that may or may not be connected to this possible ARG is @elliottgraves, who popped up yesterday and accused @simeonhobbes and @epithetalpha of being responsible for his brother's disappearance. Graves' avatar, the number 27, corresponds directly to the video "Who is Simeon Hobbes?" on YouTube, in which the morse code spelled out 27 repeatedly. Out of all of them, this one seems most likely to be connected to the this possible ARG and not some extraneous fan concoction.
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Soemone named Edmund Cartwright (@edmundloom) popped up about 23 hours ago, with the opening tweet "We Shed so that we may Pick. We Pick so that we may Batten. We Batten so that we may Take Up unto Completion." I'm not exactly sure how this is connected, but I want to lean toward unconnected on this account as well. However, this account was mentioned by Elliott Graves, so it may be connected. I'm going to go with questionable.
Graves also mentioned Menhit (@FleurDeNoire), whose only post has been "The Empire Never Ended," which is a reference to a Philip K. Dick quote. Dick, who wrote the book VALIS which was featured in the episode "Eggtown," had many dreams about the phrase "the empire never ended," leading it to become a recurring quote in his books, including VALIS. As for the legitimacy of this account, I'm going to say that it's too soon to tell.
Another name mentioned by Graves was Opet (@TheCruxAnsata), who most recently posted a Tweet that stated (in morse code) that "It begins tomorrow." What begins is unknown. As with FleurDeNoire, it's too soon to tell.
Meanwhile, it appears that @epithetalpha's Twitter account has been hacked (likely as part of the game) by a person naming themself as Aidoneus, and posting a link to 27project.org. It seems likely to me that this Aidoneus is actually Elliott Graves, who apparently has a similar vendetta against epithetalpha and Simeon Hobbes. Whatever the case, Aidoneus certainly believes that epithetalpha and Simeon Hobbes are bad people.
I'm not quite sure what to make of this new Twitter based potential ARG yet. Is any of it connected to the show, or is it still a fan having fun? Stay tuned for updates.
Update 1: No sooner do I post that than a new account pops up, courtesy of @edmundloom. @mrsmarkham, or Elizabeth Penrose, posted a link to a YouTube video which featured paintings being shown to music. The paintings appeared to be about battles between angels and demons.
Update 2: It certainly seems that the only accounts actually connected to the Simeon Hobbes game are @simeonhobbes, @epithetalpha and @elliottgraves. Is it official? Still uncertain, but its certainly interesting to watch!
Update 3: Due to the content being posted by @esausolon, I'm almost 100% certain that account is not related to the SimeonHobbes ARG.