I don't have a timeline currently. V3 is new enough that people are in the process of figuring out how to make things work smoothly, and currently both Eleonor and stebb are looking into things. There's also been mention that a special migration tool may be coming soon, but I don't know many more details than that. So I'll say that it's being looked at and worked on, but at the moment I don't have any particular ETA as to when that will be, but when I know something more specific I'll make an update accordingly.