Waiting a few more months to get 2016 model may fetch you a few more bucks than a 2015 model, at the time of sale. This is the biggest benefit. On the other hand, if you plan to keep the car for a good 5-6 years or more, then this thing may have negligible effect owing to ever increasing trend of inflation, but if you are kind of a person, who keeps on changing cars in the short-run, then waiting for 2016 model would be the best bet.
Why would IMC even think of introducing any facelift even in near future when the current model has almost increased their profit after tax by a whopping 133% (Rs 9.1 billion in June 2015 as compared to Rs 3.9 billion in June 2014) :O?