Zytek powered Lola chassis, all the same, with a power boost button which adds about 40bhp but is limited to a certain number of uses per race. This year they push about 550bhp, next year they'll be closer to 750. The thing with them is that the engine note that they make around Brands is enough to send shivers down your spine - it's like watching F1 cars flying into paddock hill bend, because of the natural bowl that is Brands Hatch.
Next years cars are being designed and built by ferrari, and I believe the plan is to remove some of the aerodynamic downforce, and replace it with mechanical grop - so I think its going to be F1 type cars (rumoured to be like last years f2007) the way they'd be if F1 wasn't full of stupid regulations, ie full sized slicks, cars which slide around the corners, etc....
All in all, next years A1GP series should be even better - today was pretty exciting though, the noise from the fans was excellent when Kerr emerged from the pits to take the lead....