CNN brought the image of an election correspondent into their studios using some new technology, claiming that it's a hologram much like R2D2's projection of Princess Leia. I haven't checked the details yet so I still have a few questions.
Although 35 high-def cameras were used to capture the moving image of Jessica Yellin, it appears that she was superimposed onto the studio image with Wolf Blitzer. Using a lot of computer horsepower that tracks the motion of the studio camera while stitching a portion of the 35 camera images together, then her image was probably digitally added to the studio shot. I don't think Wolf Blitzer saw her other than on a monitor. Note how slowly the studio cameras move, repeating the same "trajectory". Digital effects studios use this technology all the time, though in their case, the processing is done after the images are captured. And these aren't "holograms"...not by a longshot. But what makes the CNN effort noteworthy is that all the processing is done realtime. That's a massive amount of data. CNN showed that what was theoretically possible was, in fact, really possible...and doable. I'm sure they weren't the first, but they were the first to bring it to the masses.
Will this catch on? With some improvements, I think it will make a nice addition to the variety of tools that networks use. It sounds like an expensive setup and I don't think we'll see it used with correspondents in varied locations (e.g. warzones). Rather, some studios will probably be modified so you can have a roundtable discussion, for example, with participants apparently in the same studio.
The possibilities are essentially endless. Expect to see it spread in the next year or so.