https://media-cdn.mclaren.com/media/ima ... 4I8386.jpg

McLaren's new suspension set-up features a reworked upright mounting, featuring a larger extension for the top wishbone to connect to.
Previously, the horn-shaped extension had the wishbone sit on top of it, but this has now been made larger and allows the wishbone to connect to the side.
In doing so, this shortens the overall wishbone length and redefines the manner in which the suspension travels on turn-in.
It appears that McLaren wishes to further reduce the amount of roll in the corners, providing the car with a more stable aerodynamic platform along with a more consistent level of tyre contact.
How do you know there was no success? Both ideas could have simply been for data collection so the team know where to move forward with future development. These revised uprights are clearly test items and not meant to be raced.
No, it was just tested.