According to 9to5Mac, Cook told this plan to employees at the company's retail store in Berlin, Germany last week:
Specifically, Cook said that the Apple Watch will launch in Germany during the month of April. It's possible that the Apple Watch will launch first in the United States in early April, with Germany and other countries following later in the month, but it definitely appears that the Watch's rollout will be more aggressive than the first iPhone and iPad launches…
New Apple products often roll out in a limited selection of countries at first, expanding to a greater selection of locations in the weeks following the initial launch. Germany is often finds itself in the first or second wave of Apple product releases.
At the same event, Cook reportedly spoke about some of the apps that were coming to the Apple Watch, such as apps from hotels that allow you to check in from your wrist. Apps are also apparently expected from companies like Panera Break. From 9to5Mac:
On the other end of the spectrum, Cook said that Panera Bread is working on a WatchKit application that will allow Apple Watch users to pay for their carbs with their wrist. Panera Bread was an early Apple Pay partner with the iPhone 6 and 6 Plus last fall, so it's not a huge surprise that the company is working to jump on the Apple Watch bandwagon, too.
Cook also apparently talked a bit about enterprise efforts for the Apple Watch, including apps from Salesforce, but little beyond that was said.
Apple is expected to reveal a lot more about their plans for the Apple Watch on Monday, March 9 at their "Spring Forward" press event in San Francisco. iMore will be on hand to offer a first hand report on the festivities.