Is there any interest in an ARM based FIO?
Use an LPC11xx or LPC13xx, both could support USB direct connection in addition to Xbee.
The engineers here tend to shy away from ARMs. Most people find the ATMega micros easier to work with than the LPCs.
The LPCs we have used on designs were all the 2000 series. So you probably won’t see a LPC11xx or LPC13xx on a Fio like board any time soon.
An LPC2148 would work well for a Fio though, the 2148 offers USB support, and we do have the 2148 in stock. But again, LPCs are moderately trickier to use than the ATMegas and there probably isn’t much demand for one.