I don't think we will ever get any season updates for free. Just think of the amount of time it takes for the fans to make them. New liveries, new performance data, new helmets, new driver and team configurations, new carshapes, new physics, new billboards and sometimes new tracks/track layouts. I can understand the wish for the GPx team to release such updates, and I would also find it immensely cool, but be realistic. No company would pay that much in salaries to produce a free update of that magnitude for a product that costs 29.95£.
It's only after we've lost everything, that we are free to do anything.