Really interesting changes and they are already happening, if you have an email log in.  From the main post:

Today, we're starting to deliver on that goal with a preview of the new Outlook.com - modern email designed for the next billion mailboxes.

Webmail was first introduced with HoTMaiL in 1996. Back then, it was novel to have a personal email address you could keep for life - one that was totally independent from your business or internet service provider. Eight years later, Google introduced Gmail, which included 1 GB of storage and inbox search. And while Gmail and other webmail services like Hotmail have added some features since then, not much has fundamentally changed in webmail over the last 8 years - though yesterday's frustrations about the small size of inboxes are now things of the past. At the same time, email is becoming less and less useful as inboxes become cluttered with newsletters and social updates, and people increasingly keep up their personal connections in social networks instead of their email address books. All of this has led many to hope for a better solution so you don't have to settle for today's webmail.

 

Read more here: Introducing Outlook.com - Modern Email for the Next Billion Mailboxes