Hopefully this is a quick one for someone to answer.
We are in the process of testing what the My Site upgrade looks like. As I understood it from MSDN, we should be able to upgrade the Host and then any individual mysites one at a time. They didn't all need to be upgraded.
However, it seems that when we update the mysite host, the profile pages are automatically upgraded to 2013, which is not really what we want because users will have a hybrid experience. Profile pages are upgraded, but my site content is not.
Can anyone confirm if this is the case or if there is a way to upgrade profile/mysite individually for each user. I'm thinking no, because the profile page seems tied to the mysite host.
Thanks!
Shereen Qumsieh http://sharepointdeveloperhq.com @msshushu