Valve's refusal to comment officially on anything Half-Life 2, continues but it seems that the New Year has brought some unofficial rumours out into the open. According to an email, apparently sent from Valve engineer Rick Ellis to HalfLife2.net, The SDK (H-L 2) will be released soon. Although the comment is vague at best, it may act as a spark of hope to the many gamers eagerly awaitng the cursed sequel's release, considering that the release of an SDK either immediately preceeds or follows th…