Shimano is replacing only affected cranksets with their 12 speed cranks. The 12 speed cranks are visually different when the chain rings are replaced with 11 speed chainrings. Furthermore, the 12 speed crankset  construction seems identical to the 11 speed cranks.
One online reviewer (Hambini on You Tube)suggests using 105 11 speed cranks or Rotor Cranks to replace the 11 speed Ultegra or DuraAce cranks.These cranks have the 24 mm axle with the same length to fit your current BB. Any other high end crank will probably require a new BB--which puts you into BB hell with all of the umpteen different BB options.

Shimano is being quite nasty on their crank replacement policy. They should be replacing all of the cranks. Apparently, it is not if your crank will fail but when will it fail.  There are several You Tube videos going  back one to three years ago documenting the shoddy engineering of their construction technique with the use of epoxy  to join 2 halves of the cranksets ( the 105's are welded but weigh more).

When will class action lawsuits start?

Ed Cahill

Shimano is replacing only affected cranksets with their 12 speed cranks. The 12 speed cranks are visually different when the chain rings are replaced with 11 speed chainrings. Furthermore, the 12 speed crankset  construction seems identical to the 11 speed cranks.
One online reviewer (Hambini on You Tube)suggests using 105 11 speed cranks or Rotor Cranks to replace the 11 speed Ultegra or DuraAce cranks.These cranks have the 24 mm axle with the same length to fit your current BB. Any other high end crank will probably require a new BB--which puts you into BB hell with all of the umpteen different BB options.

Shimano is being quite nasty on their crank replacement policy. They should be replacing all of the cranks. Apparently, it is not if your crank will fail but when will it fail.  There are several You Tube videos going  back one to three years ago documenting the shoddy engineering of their construction technique with the use of epoxy  to join 2 halves of the cranksets ( the 105's are welded but weigh more).

When will class action lawsuits start?

Ed Cahill

Here's two good videos possibly on why the Shimano cranks are failing.

https://www.youtube.com/watch?v=Rj__lexd_BI

This videos points out section in the cranks to look for defects.

https://www.youtube.com/watch?v=FkEkQV-zK0s&t=121s

What does anybody with a bike with one of the affected cranks also think that the dealer knew about the failure also and continued to sell the bikes?

Class action lawsuit against Shimano over faulty bike cranks.

https://www.cyclingnews.com/news/shiman … et-recall/

Where do I sign?

Bike Radar article on Shimano failing cranks lawsuit.

https://www.bikeradar.com/news/shimano- … n-lawsuit/

Shimano sales down 25% YTD; Recall cost to-date: $114M

TOKYO (BRAIN) — Shimano is reporting that sales in bike-related products were down 24.8% in the first three quarters of its fiscal year, compared to the same period last year. The company's operating income in its bike business was down 48.8% over the same period. The company reported that a "free inspection program" — an apparent reference to the global inspection and replacement program involving millions of Hollowtech cranksets — had cost 17 billion yen ($114 million) in the third quarter, which Shimano categorized as an extraordinary loss.

Fine historical article from the Escape Collective about the crank arms:
https://escapecollective.com/shimanos-c … ast-years/