A bit slow on this one, granted. Simon Bisson at ZDNet UK managed to snap this screenshot of Office 365 with the email open. As I predicted, it has barely changed, ensuring existing users will have a consistent end-user experience.
Below, edited slightly to fit on screen, the email inbox of Office 365 for Education is nearly identical to that of existing Live@edu inboxes. It will still use Outlook Web Apps technology to run the email interface, running off Exchange 2010 behind the scenes, but just with a slightly different feel.
New: Office 365 for Education
Old (for comparison): Live@edu