There was a second announcement made today by the Office 365 identify team that the self-service password reset capability had been added. This feature had actually only be available to Azure Active Directory (AD) Premium customers however this feature will now be available to Office 365 customers.
The main caveat of this release is that it will work with customers using Cloud Based IDs. If you are a federated authentication with Office 365, and you want to have this feature, you need to purchase Azure Active Directory Premium to support the write back of the password to the on-premises Active Directory that is federated with Office 365.
Announcement is located here - http://blogs.office.com/2015/02/17/sign-page-branding-cloud-user-self-service-password-reset-office-365/. Additionally in this blog, there is a really good table in here that accurately explains the Azure AD Features that come with Office 365 and which features require Azure AD Premium.
There is good detailed information located off of here on how to configure and manage the Self0service password reset feature of Azure AD - https://msdn.microsoft.com/en-us/library/azure/dn510386.aspx.