Guys the word is that PS3 wheels won't work with PS4, unless the game developers provide drivers.
Logitech are no longer making wheels, so it is highly unlikely that they will work on PS4.
Will PS3 peripherals such as fighting sticks and steering wheels work with PS4?
Generally speaking, no. However, at launch, users will be able to use these controllers if a specific game title allows it to be used within the game. This decision is upon the game developer and will vary from game to game.
http://www.thesixthaxis.com/2013/06/18/driveclub-will-support-all-ps4-wheels-studio-aiming-at-60fps/
In a behind closed doors session with TheSixthAxis last week, Evolution’s Col Rodgers confirmed that the game will support every wheel that works with the PS4. Hopefully that also means that current PS3 wheels will also work just fine, although that’s not 100% guaranteed.
Just thought you should know before spending your cash, it looks 50/50 at the minute