One part of me thinks that Blizzard is acting too much like a babysitter. By the time we start playing WoW, we may have some concept of time management. Though some folks truly have a problem with gaming, I think most players can manage their time responsibly without these bells and whistles. I'm sure at some point it'll come in handy. For instance, if I'm waiting for a friend to come over, I can set the alarm to go over before she's due to arrive. You could set it to remind yourself that the WoW Insider show is starting at 3:30 PM.
The stopwatch could be useful for keeping an eye on queue times, or measuring encounters. If nothing else, I'll probably use it for cooking, since I hate the timer on my stove. I usually use AV for that now anyway, which is imperfect. Or maybe I'll just keep doing what I've always done, and ignore the new toys.
What are you going to do to with your clock?