If a new predator moved into the region, it would predate on rabbits and result in decreased rabbit population. This would cause a change in the dynamics of the forest. With a new predator in the forest, there would competition with existing predators. More predators mean more food requirement and hence lesser population of their preferred food (rabbit, in this case). Under these circumstances, predator's population may increase and that of rabbits will decrease. Over time, there would be a new equilibrium in the forest, with a certain population of predators and a reduced population of rabbits, supporting them. A reduced rabbit population will also mean more grass (or whatever food rabbits eat).
In general, any change in food chain by introduction or removal at any trophic level will cause changes throughout the chain.
Hope this helps.
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