Thank you John; very helpful to know what is happening.
2 questions at the moment; may be more later!

I think I remember reading that blogs created since the October Glow migration won't migrate; have I got that right?

My class have their eportfolios in their own space; the older ones have had them longer than the LA eportfolio theme which Alex Duff created but have all changed the theme to that. Should I get them to save the url of their eportfolio somewhere so they can find it after migration or will they still see it from their blogs tile?