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Prep Conductor was announced at TC18 a few weeks ago!
Tableau Prep Conductor — Available in beta today, Tableau Prep conductor is a separately purchased add-on to Tableau Online and Tableau Server that lets you schedule and run the flows you authored with the Tableau Prep application from the browser.
Thanks Matt; Prep Conductor looks great and I'm super excited about some other features coming out too. I'd still like to get the command line scheduling to work as the separately purchased add-on thing might be an issue but we'll see. I posted in reply to another question that was having a similar credentials issue as me when publishing a data source to Tableau Server as an output of a flow.