What does Sony’s Gaikai buy mean for PS4?

What does Sony's Gaikai buy mean for PS4?

Sony's acquisition of Gaikai, in a $380 million deal announced this morning, will enable the company to launch a cloud gaming service of its own, promising to bring core and casual games to internet-connected devices everywhere. It's a smart move for a company with  business interests in many areas that suit cloud gaming – smart TVs, internet-connected Blu-ray players, smartphones and tablets – but what does it mean for PlayStation 4?