Talent is more visible now across various functional silos, so your boss may know where the opportunities for advancement are -- not just in his or her area but in others areas as well.

CEOs will rarely admit it in public, but privately they say they're worried about having enough qualified people to fill leadership roles as baby boomers retire. So more big companies now are actively analyzing where the gaps are likely to be, and which skills they need to be giving people the chance to develop right now.

One of the big issues for companies now is, do you tell someone they're considered a high-potential? If you do, the person may get their hopes up and be disappointed later. But if you tell them they're not, they may quit.