Well, which car are you looking to buy !!
If its Maruti Suzuki, Tata Motors or Mahindra - where all parts are obtained locally - not much of an impact
However, if keen to buy Honda, Toyota, Volkswagen, Ford or Chevrolet - with Indian currency devaluation, the import cost has increased for these manufacturers.. Though the price have almost increased 5-6 times in last 2 yrs.. But, be ready for another price hike if rupee sustains on level of 57 or more for some more time, as no manufacturer would like to absorb costs - in event of low sales, giving already higher fixed costs