I asked the question to all parties regarding the compatibility of G25 with PS4.
These are the relies:
Playstation- Just to let you know that we, unfortunately are not allowed to discuss 3rd party products. The only thing I could advise would be to contact Logitech.
I hope this helps, but if you have any other questions please contact PlayStation Support using the contact details below or by replying to this e-mail.
Logitech-
I understand from you that you would like information regarding the compatibility of G25 Racing Wheel with PS4.
The compatibility of the wheel in the case of Playstation is provided by the game itself, at the PS4 has USB port, technically it should not be a problem for G27/G25 but we must refer to the game developer to check if it is supported. At this time Project Cars has announced that only the Thrustmaster brand is supported with their game.
Logitech usually provide the drivers to game developers to include a give support to the wheel, finally is a decision of them to include them to support the wheel or not.
Codemasters-
Thank you for submitting your recent request to Codemasters Customer Services concerning F1 2014.
Unfortunately we do not have those type of details on the game at the current time. Full details will be made available on our website, closer to the game's release date.
Project cars- NO REPLY- The website does state "Slightly Mad Studios is committed to ensuring as many wheels and controllers are supported at launch as possible." However they do seem to have a contract with Thrustmaster but its not a definite no to other wheel compatibility.
Clarification would be nice but what are you to do. If Logitech say they can be used if the game developers add the drivers, you would have to say that its the game developers shafting everyone. Probably end up needing a different wheel for every game. Money over logic.
Don't know if it will make a difference, but cant do any harm. Sign this petition
http://www.change.org/p/sony-add-logitech-and-fanatec-wheel-support-to-ps4