I waited months to be migrated from BPOS to Office 365 but got fed up and migrated myself in the end.
I'm not sure how much different Exchange Online 2013 and Lync Online 2013 are going to be, as I didn't really use them during the Preview. I just used Office 2013 with my main O356 account.
I'd like to know when current O365 subscribers get access to Office 2013 as well.