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It's been more than 15 months since Microsoft, owner of the Xbox gaming system, first revealed its plans to buy the publisher of popular game franchises like Call of Duty, World of Warcraft and Candy Crush. But there's no end in sight.

HOW MANY LIVES LEFT?

The deal awaits an important May decision from antitrust regulators representing the 27-nation European Union. It must also undergo an August trial in the U.S. before an administrative judge at the Federal Trade Commission. But a former FTC official says the U.K. decision could be a deal-breaker, especially if the appeals tribunal follows its “very deferential” approach to the regulator.

“If this were a smaller jurisdiction with a tiny population, the companies could shrug and say, ‘We just won’t do business there,’” said former FTC Chair William Kovacic. “They can’t do that very effectively with the United Kingdom. So a U.K. decision to block is basically a global decision to block the transaction.”

WHAT DOES IT MEAN FOR GAMERS?

Nothing for now. But even if Microsoft is able to complete the purchase, the average gamer is not going to notice immediate changes.

Harder to assess are the long-term effects on the games that get made and how people can play them, said Liam Deane, a game industry analyst at Omdia. That's part of what antitrust enforcers around the world have spent the past year investigating.

Microsoft had promised to keep popular titles like Call of Duty on rival platforms like Sony's PlayStation and Nintendo for at least a decade, but future Activision Blizzard games could be exclusive to Xbox.

“Down the line, it would have quite a big impact,” Deane said. “Activision is a big publisher, it has a big market share” and that could affect the “relative strength of the different console platforms.”

HAVE OTHER COUNTRIES APPROVED IT?

Yes, the deal won approval March 28 in Japan, a hub for game development and the home of both Sony and Nintendo. It's also been approved in Brazil, South Africa and some smaller markets.

WHY DID U.K. BLOCK IT?

It was the small but growing cloud gaming market, not the existing console rivalry between Xbox and Sony, that the Competition and Markets Authority said it was concerned about.

Streaming games to tablets, phones and other devices has freed players from buying expensive consoles and gaming computers.

“What the CMA said, essentially, is that in cloud gaming Microsoft is the market leader," Deane said. "And even though that is a smaller market, it’s one that’s at a critical stage where it’s just starting to take off and potentially that is going to become a huge platform in the future. And therefore it would be a risk to competition to strengthen Microsoft’s position in that market where they’re already leading.”

The watchdog said it reviewed Microsoft’s proposed remedies but found they would require its oversight, whereas preventing the merger would allow cloud gaming to develop without intervention.

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AP writer Kelvin Chan in London contributed to this report.