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I wouldn't expect anything other than support for three cards in a similar fashion to how it is now.
 
Where are the .kext files for graphic cards placed?

Update:
Currently I see the following

Intel GMA950, ATI Radeon X2000, Geforce 8xxx, ATI Radeon 8500, ATI Radeon 9700, ATI Radeon, ATI Radeon X1000, GeforceFX,
 
Where are the .kext files for graphic cards placed?

Update:
Currently I see the following

Intel GMA950, ATI Radeon X2000, Geforce 8xxx, ATI Radeon 8500, ATI Radeon 9700, ATI Radeon, ATI Radeon X1000, GeforceFX,


so the cards you listed all have kexts (drivers) in the extensions folder ?
 
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