Ask HN: What is the transition from cubicles to open office like?

Found out our office is going to be turned completely open concept soon. This will be a big change as right now we all have cubicles, which I like because they give some sense of privacy and help to muffle the overall noise level.

I've never worked in an open office before. For anyone with experience working in open/closed (cubicled)/semi-closed offices, which did you prefer? What should I expect?