hmmmm ... I haven't got the email yet, so maybe it's a staged rollout.
At TC17 they said that Tableau Public had been running on hyper for a while, so I'm hoping there's no bugs left in the product at all
I also think for Tableau Online it's less of an issue - you can't control the server software and downgrade, so the upgrade shouldn't be an issue.
Also, Tableau know more than any of us that downgrading is not possible, so if there is a bug I'm sure they will fix it "quicker than ASAP"
I'm looking forward to it though, if Tableau Online is being upgraded then Tableau Server will follow soon and I have a client that is dying for some 10.5 features
These two contain plenty of advice and scenarios to better prepare for the upgrade.
Lénaïc RIÉDINGER, Global Community Engineer Tableau
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I would also suggest reviewing the section in the Tableau Online Upgrade Guide that discusses the file conversions for .tde to .hyper files with Tableau Online.
- Once an extract has been upgraded to the new .hyper extract format, the change is not reversible. This means that the upgraded extract cannot be converted back to a .tde extract and that upgraded extracts cannot be read by the Tableau 10.4 (earlier) data engine.
IF your organization cannot upgradeits clients immediately, then using the 10.4 Bridge with a FULL refresh will not update the .tde to .hyper. Same with the 10.4 Tableau Data Extract Command-Line Utility.
ALL other actions WILL upgrade the .tde to .hype. This is IRREVERSIBLE, there is no way to downgrade or convert .hyper back to .tde.
Hope this additional information helps!