Expand a NWA 3560-N controlled network

Good evening,
a customer of mine have a network of 15 NWA3560-N access point with a NWA3560-N set up as controller.
They want to add some more recent access point in some areas to obtain more troughtput. 
Is there a new controller capable of managing both old NWA3560-N and new access point ? 
Thank you,

Best regards,

Pier Luigi