This is a mega-mega-merger. Disney is buying all of 21st Century Fox (and the 20th Century Fox library). Basically everything that is labeled Fox...except for Fox News.
Also, James Murdoch (Rupert's youngest son) is leaving his dad's company to join the new Disney company--possibly as the head of television--and Robert Iger is staying on as CEO for a few more years (he was scheduled to retire next year).
I'm still processing this one. It's out of left field.