This is, funnily enough, the question I asked of both RTCC and MMC when there was an engine delay in August/September of this year.
So my 'guess' would be as BMW have phased out the 4.4 V8 in their range and replaced it with the 4.8 V8, the new Aero will also receive this engine.
Hardly Sherlock Holmes on my part but a pretty reasonable guesstimate of changes at hand with respect to the Aero 8
