Had a little time on my hand so decided to make a rendering.... after seeing the S60 i have high hopes for the next S80
Not only is that image stunning looking but the decision (if true) that Volvo will be repricing their models downwards and away for that of Audi, BMW and Mercedes yet retaining their build quality and materials will make this and the rest of the range very appealing to a range of potential customers that up to now Volvo was never on their radar.
My guess if Volvo keep with the current design language your render is probably pretty close to what Volvo will produce, however I think with the next S80/V70 Volvo will introduce a new look.