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Ste_S-
Can't remember which article I read but it seemed to suggest this new groupset is entirely replacing Athena.
[edit]
Though Campagnolo had an existing mid-range 11-speed group, Athena, the decision was made to create a new group, rather than redesign an existing one. I did ask why a new group was considered preferable to updating Athena, and I didn’t get a very clear answer.
That's from the bicycling.com article. A bit vague tbh.
From elsewhere (cxmagazine)
The group is designed to compete with Shimano’s Ultegra kit and replaces the Athena groupo in the line-up.
Tychom
Power torque with a self extracting bolt looks like they've addressed the major issue.