Hi,
I got an e-mail from the Office365 team back on January 14th saying I would be upgraded in the next few weeks, and that another e-mail 24 - 48 hours before hand would give more details. Since Office 365 2013 goes on sale in the US tomorrow, along with Office 2013, I would guess thatis what the update will do. As for dates for all, hard to do when they have ne experience in this, I would think after they move US users over, they will have a better idea on how long it takes, and then set more detailed schedules.