VW state in the recall information that no compensation or buybacks will happen as the car will be perfectly legal and roadworthy after the update. Taken directly from ELSA. Still don't know full details but they reckon an hour or two for recalled vehicles so probably just a software update. All 1.2, 1.6 and 2.0 common rails affected. A 2009 Passat I was working on is subject to the recall so it goes back to the start of the common rails around 2008.
They will of course state that about but backs and compensation however what happens in reality could be very different, especially if the vehicle is significantly different to the vehicle the customer bought originally in terms of its performance and economy! This is especially true in the USA where buy backs are a common occurrence anyway in some states due to their consumer law