To get your wacom bamboo fun CTH-661 working, start by installing xf86-input-wacom and adding this to your /etc/rc.conf:
devd_enable="YES" #To use a wacom tablet
webcamd_enable="YES" #To use a wacom tablet (and a webcam if you have it)
I recently installed FreeBSD on my X230 tablet and nearly everything works perfectly. But I have two issues with the Wacom things:
The touch screen behaves strangly: At about every second touch the pointer moves only half the way from it's current to it's new position and it is...
I initially installed 11 RCs - 10 and earlier don't have drivers for the USB on the motherboard so I can't even install from a USB drive.
On RC3 a Wacom Inuos appeared to be working following the instructions at https://wiki.freebsd.org/WacomTablet although I didn't have chance to test fully...