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Atom Testing has been enjoyable so far in F1, particularly because of the innovation already on show. The prospect of a mid-grid team - Renault - having come up with a new innovation in F1 is exciting. They've got exhausts coming out of the sidepods instead of the back of the car. This should increase the amount of pressure underneath the car.
Sending exhaust fumes out using the Renault way should become increasingly useful in future seasons because the energy coming from the engine could be used to help power KERS. According to the rules, KERS has to be positioned between the cockpit and the front of the engine, so the movement of the fumes would be a viable means of kinetic energy recovery. Without the need for long-distance transmission of the energy before release, it would be possible to use a much greater proportion of the energy using this source than from the brakes. Energy harvesting would occur under acceleration (when there is generally little demand on the driver), which makes for much better handling than the brake-harvesting version (which ends up altering the behaviour of the car at the point where it is already at its least predictable).
Given that the Le Mans Series primary prototype class now allows any form of energy recovery rather than just the kinetic variety, it's conceivable that an enlightened FIA might permit heat recovery - another mechanism which would make the sidepod-exhausts more useful. Airbox kinetic/heat energy harvesting would be even more useful, but maybe that's hoping for too much innovation from a governing body which stands to gain from regulating as much as possible using as many rules as possible.
I don't agree with KERS in top-level racing, but if we must have KERS, it should be a sensible version. Hopefully, Renault's discovery will encourage the FIA to permit the best of a bad job to be made.