I had similar experience but other way round so it was an easy choice. Water pump was going (on Ford Laser) and we changed the timing belt at the same time - car has 250,000 kms.
However, in your case, It is a little harder ... just need to use your head and do some research and think whether you will sell your car before it 'may' need changing. Not saying it needs changing but yes, it is a lot of guess work unfortunately.
I have not heard of many water pumps failing on these cars as it is a relatively new car. Maybe the French built something good ! It is a small price to add to the service if you intend to keep the car for another 150,000 kms but not worthwhile if it does not need changing.
Get the mech to look at it, hopefully he will say, "no probs, that is a piece of cake to check" and "no need to change mate."