World Of Warcraft: 4 Senior Staff Leave Blizzard North

A quote from Yahoo biz section.

In a statement, Blizzard Entertainment said Blizzard North co-founders Erich Schaefer, Max Schaefer and David Brevik, along with a fourth employee, Bill Roper, "resigned from the company to pursue other opportunities.

This is very sad news but should not effect WoW too much, since most of the people who left were on the Blizzard North team. I just hope they find some really great people to replace those who left (they got a lot to live up to).
Check out the Yahoo press release here