Hi @simplice, there is no migration procedure yet but it is planned. I can’t give you an exact ETA, but we’ll try to provide at least a partial import feature as soon as possible. It should come right after we’ve added SSO (which we’re working on as we speak).
We actually made a call for help in our latest release announcement about anyone that can provide us with export files from Taiga in order to help us on this. If you have one you can provide we would be glad for it! Same for @siliconalchemy by the way 
Cheers 