Perhaps because it's nearly 10 years old. That is likely the main reason why Volvo has just confirmed they are working on a new XC90 crossover. No other details were confirmed such as new safety features and price. However, don't expect for it to launch anytime too soon, as CEO of Volvo North America, Doug Speck, implied there could even be a facelift of the current model before the redesign debuts.
The XC90 crossover is a very important factor for Volvo and is considered to be one of their main bread and butter models. The current XC90 hasn't changed much since its debut and is now beyond out of date when compared to a long list of competitors. More details should begin to appear in the coming months with a possible concept version appearing at an auto show sometime in 2012.