Here in the Netherlands I would say that the car keeps a very high value.
At least if one looks at the "occasions" section of some volvo dealers one can
find V40's with around 10.000 kms and that cost only very few thousand euros
less than a brand new one with the same specifications.
I have even seen some with 20.000 kms and almost same price as the new one, which I would find a very crazy buy....
The problem is that the car is really still too new. It's only been out for 1 year now and it is rather desirable, which is going to keep the 2nd hand prices higher for a while to come.
That said, Volvo do tend to keep higher than average resale prices. If I look at Volvo's predictions, they expect the car to lose 15k of the 27k purchase price over the next 4 years. 44% value after 4 years is good. Only time will tell.