Earlier versions of the IB-5 just had 2 wire pickups, so it looks like the factory has updated the pups. The photo is not quite sharp enough to be certain, but it looks they've just added the coil series link wires makng it a 4 wire pup. If the red/white twisted pair are soldered at the tip then they should be the series link between the two coils within the pickup. That means the green and black are your ground and hot wires (matching the two wires in the wiring diagram). If that's a bare wire twisted with the green then that should be the ground and the black would be your hot. Just put some insulating tape on the series link tip so it can't short with anything. I can't be certain without a better pic, but that's my best guess without access to one of the new pups to test.
If you have a multimeter you can check which wires are which and it would also tell you which pup has the higher resistance (bridge is usually slightly higher than neck). Also, the factory typically makes the wires on the neck pup slightly longer than the bridge, so that may be another way to tell them apart.