While you wait for Joe, you can have the inferior me.
So yeah, this demo stuff. At least as late as March last year, Gearbox was happily showing off that Sulaco intro demo, which, as we all know now, looks far superior to the real game. The other demo, the one I walked through for Jimquisition, was shown multiple times at E3 and PAX. I've seen it "played live" before. Anyone who went to PAX can tell you they pretended to play it -- had controls set up and everything.
Rewatching it on Youtube, motion-for-motion matching what I saw "played" at PAX, makes it pretty clear it wasn't real gameplay. It was always a conceptual mockup.
Now, that's fine, yes? Developers do "concept" footage all the time. I know someone here said my Jimquisition was "BS" because of this. However, unlike Killzone 2 or similar not-really-gameplay videos, Gearbox never 'fessed up. What's more, this "gameplay" was used multiple times for trailers and screenshots. It was never presented as anything less than actual gameplay, that would feature in the actual game. At least we knew Killzone 2's first footage was fake before the game came out.
Not once was anybody told that the screenshot of the power loader fighting the Alien Queen was pure fantasy. Right up until I had code in my hand, I was never told not to expect the things I'd been told to expect. Imagine my surprise when the Queen is fought ... oh wait, I said fought. Ha ha. I'm not actually laughing, there.