Before we all go off the deep end, the survey could mean just about ANYTHING at this point.
JK3? That's just VoodooExtreme being wishful (and wouldn't we all be?).
I'd love to have a SP game where we "played as the villians" or had the option to. I'd love to see squad based multiplayer modes (well we already have that in an alpha stage as Saga, but still) etc. and coop of course!
At this point I think that an expansion would be more likely than a full out sequel, but who knows. Until Raven/LEC says so, we have no idea. But we can dream... ; )