The Microsoft campaign for their new phone OS is centered on the fact that our attention is sucked in by our phones, preventing us from a compeling and respectful social life. The Windows phone, because it offers you a quick glance at your digital life, will allow you to be more efficient with your digital life and get back to your "real" life much faster.
While this observation is very accurate and in the mood these days, I'm pretty sure the solution offered here is not going to be efficient at all. It will most certainly have the opposite effect.
As others have noticed, the problem with our behavior when we interact with phones doesn't come from the interaction models, but from the content itself. You read articles from the web, exchange text messages, check Twitter or Facebook. The time you spend accessing this content is a small percentage of the time you spend consuming it.
If I understood the product description well, the home screen of the Windows phone is going to be the dashboard of your digital life. Each part of it will reflect on the activity of your friends and other content your care most about. Wishfull thinking, but each part of it will be a reminder that you are missing something in your connected life. Each part of it will be an invitation to get sucked in. All the time.
It's a big push notifications agregrator right in your face as soon as you get your phone out of your pocket. Not really what's advertised.