The NeoGAF poster ntkrnl (verified to be a legimate source by a moderator) has listed the countries where Xbox One will hit next.
The following countries were listed as April releases: Japan, South Korea, Taiwan, Singapore, Hong Kong, Russia, Sweden, Norway, Finland, Denmark, Colombia, Chile, Argentina.
These countries are listed as October launches: China, Poland, Czech Rep., Hungary, Greece, Portugal, Slovakia, Turkey, Saudi Arabia, South Africa, United Allied Emirates, Israel, India, Indonesia, Egypt.
Curiously the Benelux countries and Switzerland are nowhere to be seen, then again there is nothing to say that these lists are complete. Once again this is nothing confirmed at this point.