Honda has announced that they will have an engine upgrade ready for this weekend's race, the Japanese Manufacture will now use it's remaining four tokens.
The tokens have been spent on improving several power unit component parts, so are not just restricted to the international combustion area. However, the exact specification of the upgrade will be made clearer over the course of the weekend.
Unfortunately, Honda can only afford to give its engine to one of the drivers and it is expected that Fernando Alonso will receive the upgraded Power Unit. But on the flipside, Jenson Button should have a better starting position because taking a new engine will mean that Alonso will begin his race at the back.
Bahrain International Circuit - Winter testing