I wouldn't lose hope now, actually. If you think about it, this all makes perfect sense: the christmas sales and new free demo of HD did enough to keep the game from being forgotten (haven't checked the leaderboards for venom singlerace vineta in the last days, but I'm pretty sure numbers have gone considerably up from 230,000 over the holidays), and now they just wait till the interest starts to faint again, and that will be the time for DLC. My guess is March or April.

Still, it would be much appreciated if any of the SL guys (Colin, Crob, Egg, ...) could at least give us a short notice of what they're currently up to - but then I guess they are probably on holidays right now

Plus, thinking even further, they probably can't say anything. If they are indeed working on DLC, they can't tell us, because you only tell stuff like that to the interwebs when it's DONE, and if they (god forbid) actually abandoned the idea of DLC for whatever reason, they can't tell us either, because that would spread over the interwebs like a bushfire and people would put down the game even sooner, or refrain from buying it in the first place.

Make any sense?