Yes, Nutaq offers boards that interface with the digital processing module.
The ADACMaster III module interfaces through the expansion connector.
The RF modules interface through the GPIO connector and can also be connected to the ADACMaster III through the SMA connectors. The supported RF modules are:
+ The Low-Band Tunable RF Module
+ The High-Band Tunable RF Module
+  The 2.5 GHz WIMAX Wideband RF Module
+ The 2.5 GHz WIMAX Narrowband RF Module
No other expansion boards are developed by Nutaq at this time. It is however possible for you to design your own expansion board and connect it through the expansion connector or the GPIO.