I'm a bit short on gobbos right now... I was hoping to somehow summon the entity known as the mighty Dev to answer me, but I knew it was a long shot.
Honestly bro- I don' think the devs have a clue when a2 will release. They have been saying one more year since years ago and the goal post keeps moving.
I don't think it is intentionally malicious false advertising- rather just some combination of overconfidence / ignorance / optimism. Throw in some speed-bumps with the writing team (personnel roller-coaster / low production from a few of the writers / side fluff content to train new writers on) and if you're looking at what still needs written in game one, you are still looking at maybe another full year or two of releases before you get a whiff of act2.
Pay attention to the bulk of the next release. It will be the second release since the team got 3 new writers. Will prob showcase how development might go over the next bit.