All by the end of 2013
Today Sony announced at their gamescom conference that the PlayStation 4 will be launching in 32 different countries by the end of the year. Those countries are: United States, Canada, Mexico, Brazil, Australia, New Zealand, United Kingdom, France, Germany, Spain, Italy, Ireland, Austria, Belgium, Denmark, Finland, Luxembourg, Netherlands, Norway, Poland, Portugal, Russia, Sweden, Switzerland, Argentina, Chile, Colombia, Costa Rica, El Salvador, Guatemala, Panama, and Peru.
The PlayStation 4 will be out in North America on November 15 for $399, and in Europe on November 29 for €399, and £349 in the United Kingdom. No exact timing or pricing was given for the other countries, but it's only a matter of time before all that is announced.
Also worth noting that Sony didn't mention a release date for Japan. I suspect they're saving any announcements for their home country at the Tokyo Game Show. In fact, their TGS press conference is slated to be held next month, on September 9.