Audi RS5 in the Pipeline?

Car Magazine from the UK reports about a possible Audi RS5 mule on the roads. There has been no confirmation whether this really is the M3 killer, but why would they test an S5 (the mule looks exactly like an S5) with so many sensors, if it wasn't to test something substantial? Car Magazine received confirmation from Audi that there is indeed an RS5 in the pipelines. We expect that it will see the official light of day at Frankfurt. The computer rendering shown is by CGIAutomotive (he's Australian). Let us know what you think, is this really the RS5, or just an S5 undergoing final testing?