I already asked this in the feature announcement (here), but got no reply so far so I'm posting this as separate question.
According to docu one cannot choose workflow for the imported releases directly in the csv, so I expected it to be selected automatically based on what is specified in the template or at least use the workflow that is set to default. But it seems imported releases are created without any workflow association and only one who can change it one by one would be the SDReleaseManager. That seems rather inconvinient in case of large number of imported releases.