Well they better not be trolling, or the backlash will cost them a bunch of goodwill. I wouldn't be pleased that's for sure.
You don't go through elaborate motions like fake mistake game patches, in-game puzzles and teasy tweets only to present some meh everyday bullshit at the end. ...Or at least not without taking some heavy flak from the people whose hopes you got up with nothing to show for it. *Shrug* We'll see what this is all about, but I'm personally prepared for disappointment. Poorly prepared though, but that's just because I Want To Believe. <TM>
However, I hesitate strongly at thinking this is HL3-related though, because where does Korea factor into the HL universe...? If it'd been Russian, maybe, seeing as HL2 and the Episodes supposedly take place there (even though all voice work and almost all signage throughout the games is in english.) Feels like this is going to be something new from out of Valve, because HL3/EP3/whatever would just be too left-field-ish. Maybe. Who the shit knows.