The driver internals mention ATI Radeon HD 3410, ATI Radeon HD 3550, ATI Radeon HD 3730 and Sapphire Radeon HD 3750. Here is how the information looks inside the actual driver file:
ATI Radeon HD 3410" = ati2mtag_RV610, PCI\VEN_1002&DEV_94C3&SUBSYS_30001458
ATI Radeon HD 3550 " = ati2mtag_RV610, PCI\VEN_1002&DEV_95C5&SUBSYS_3001148C
ATI Radeon HD 3730" = ati2mtag_RV630, PCI\VEN_1002&DEV_9598&SUBSYS_3000148C
Sapphire Radeon HD 3750" = ati2mtag_RV630, PCI\VEN_1002&DEV_9598&SUBSYS_3001174B
We haven't heard anything from AMD about these parts but if they are coding for them in the 8.5 graphics driver, they probably won't be too far away from being released.