As people continue to sift through the gigabyte or so of data leaked, more interesting things are being found. Under a directory game/client alongside other folders such as cstrike and ep3, is 'sob' with the filenames indicating a potential new IP. Perhaps a space shooter of sorts?
What do you think it could be and what could SOB stand for? Here is a pastebin of files provided by HL2.netter, Barnz.