I read that, but I believe this only means "both ways" for attributes, not "for attributes and annotations".
The "problem" is that till now we had the same "meta-export" which then convert the format to annotations or attributes. But now we have to include several "if-defs" to the export only because there are differences between anns and attrs.
But we have to reconcile with the fact that everything is not always perfect ;-).
Anyway, we're already working on that. As far as I know, we have to implement it for JoinColumn, InverseCoinColumn, JoinTable, Index, UniqueIndex.
I will let you know when the update will be ready.