Before the DLC revolution you bought a game and that was it. Occasionally, if the original game was a big hit, you got an 'expansion pack' six months to a year later, which was a large extension of the game - a new campaign. I think what Beth are going for this time around is somewhere between their original small free DLC and their large expansion packs. So it takes time. Be thankful it's not being made in Valve time. I've been waiting five years to see HL2: Ep. 3.