Would this be speed sensor?

 

The 3rd gen rear-wheel-only ABS system only has the one front wire and associated sensor, on the driver's side. It is a VSS (vehicle speed sensor), and is not attached to the wheel bearing. It does, however, get its data from the wheel bearing assembly, by counting the "teeth" inside the assembly as it turns. Make sure the hole where the sensor resides is clean and clear when re-installing the new hub assembly, or you will get a CEL and your cruise control will cease to function. The passenger side likely has a similar connector tucked up out of the way, but there will be no sensor connected to it.